{"id":213,"date":"2026-02-11T16:38:54","date_gmt":"2026-02-11T15:38:54","guid":{"rendered":"https:\/\/helloblog.io\/el\/krisimo-keno-asfaleias-wpvivid-backup-unauthenticated-arbitrary-file-upload\/"},"modified":"2026-02-11T16:38:54","modified_gmt":"2026-02-11T15:38:54","slug":"krisimo-keno-asfaleias-wpvivid-backup-unauthenticated-arbitrary-file-upload","status":"publish","type":"post","link":"https:\/\/helloblog.io\/el\/krisimo-keno-asfaleias-wpvivid-backup-unauthenticated-arbitrary-file-upload\/","title":{"rendered":"\u039a\u03c1\u03af\u03c3\u03b9\u03bc\u03bf \u03ba\u03b5\u03bd\u03cc \u03b1\u03c3\u03c6\u03b1\u03bb\u03b5\u03af\u03b1\u03c2 \u03c3\u03c4\u03bf WPvivid Backup: unauthenticated arbitrary file upload \u03bc\u03b5 \u03c0\u03b9\u03b8\u03b1\u03bd\u03cc \u03c0\u03bb\u03ae\u03c1\u03b5\u03c2 takeover \u03c3\u03b5 sites \u03bc\u03b5 \u03b5\u03bd\u03b5\u03c1\u03b3\u03cc \u201csend backup to site\u201d key"},"content":{"rendered":"\n<p>\u0391\u03bd \u03c4\u03c1\u03ad\u03c7\u03b5\u03b9\u03c2 WordPress \u03c3\u03b5 \u03c0\u03b1\u03c1\u03b1\u03b3\u03c9\u03b3\u03ae, \u03be\u03ad\u03c1\u03b5\u03b9\u03c2 \u03cc\u03c4\u03b9 \u03c4\u03b1 backup\/migration plugins \u03b5\u03af\u03bd\u03b1\u03b9 \u03b1\u03c0\u03cc \u03c4\u03b1 \u03c0\u03b9\u03bf \u00ab\u03b5\u03c5\u03b1\u03af\u03c3\u03b8\u03b7\u03c4\u03b1\u00bb \u03c3\u03b7\u03bc\u03b5\u03af\u03b1, \u03b3\u03b9\u03b1\u03c4\u03af \u03b1\u03bd\u03b1\u03b3\u03ba\u03b1\u03c3\u03c4\u03b9\u03ba\u03ac \u03b1\u03b3\u03b3\u03af\u03b6\u03bf\u03c5\u03bd \u03b1\u03c1\u03c7\u03b5\u03af\u03b1, paths \u03ba\u03b1\u03b9 \u03b4\u03b9\u03b1\u03b4\u03b9\u03ba\u03b1\u03c3\u03af\u03b5\u03c2 \u03bc\u03b5\u03c4\u03b1\u03c6\u03bf\u03c1\u03ac\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd. \u03a3\u03b5 \u03b1\u03c5\u03c4\u03ae \u03c4\u03b7\u03bd \u03c0\u03b5\u03c1\u03af\u03c0\u03c4\u03c9\u03c3\u03b7, \u03c4\u03bf WPvivid Backup (WPvivid Backup &#038; Migration \/ Migration, Backup, Staging) \u03b2\u03c1\u03ad\u03b8\u03b7\u03ba\u03b5 \u03bd\u03b1 \u03ad\u03c7\u03b5\u03b9 \u03bc\u03b9\u03b1 <strong>unauthenticated arbitrary file upload<\/strong> \u03b5\u03c5\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1, \u03b7 \u03bf\u03c0\u03bf\u03af\u03b1 \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03ba\u03b1\u03c4\u03b1\u03bb\u03ae\u03be\u03b5\u03b9 \u03c3\u03b5 <strong>Remote Code Execution (RCE)<\/strong> \u03ba\u03b1\u03b9 \u03c0\u03c1\u03b1\u03ba\u03c4\u03b9\u03ba\u03ac \u03c3\u03b5 \u03c0\u03bb\u03ae\u03c1\u03b5\u03c2 compromise.<\/p>\n\n\n\n<p>\u03a4\u03bf advisory \u03b1\u03c6\u03bf\u03c1\u03ac plugin \u03bc\u03b5 <strong>\u03c0\u03ac\u03bd\u03c9 \u03b1\u03c0\u03cc 800.000 \u03b5\u03bd\u03b5\u03c1\u03b3\u03ad\u03c2 \u03b5\u03b3\u03ba\u03b1\u03c4\u03b1\u03c3\u03c4\u03ac\u03c3\u03b5\u03b9\u03c2<\/strong>. \u03a0\u03b1\u03c1\u03cc\u03c4\u03b9 \u03b7 \u03b5\u03ba\u03bc\u03b5\u03c4\u03ac\u03bb\u03bb\u03b5\u03c5\u03c3\u03b7 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b9\u03b4\u03b9\u03b1\u03af\u03c4\u03b5\u03c1\u03b1 \u03c3\u03bf\u03b2\u03b1\u03c1\u03ae, \u03c5\u03c0\u03ac\u03c1\u03c7\u03b5\u03b9 \u03bc\u03b9\u03b1 \u03c3\u03b7\u03bc\u03b1\u03bd\u03c4\u03b9\u03ba\u03ae \u03bb\u03b5\u03c0\u03c4\u03bf\u03bc\u03ad\u03c1\u03b5\u03b9\u03b1: \u03c3\u03cd\u03bc\u03c6\u03c9\u03bd\u03b1 \u03bc\u03b5 \u03c4\u03b7\u03bd \u03b1\u03bd\u03ac\u03bb\u03c5\u03c3\u03b7, \u03c4\u03bf \u03ba\u03c1\u03af\u03c3\u03b9\u03bc\u03bf impact \u03b1\u03c6\u03bf\u03c1\u03ac <strong>\u03ba\u03c5\u03c1\u03af\u03c9\u03c2<\/strong> sites \u03c0\u03bf\u03c5 \u03ad\u03c7\u03bf\u03c5\u03bd \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03b5\u03b9\/\u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03b5\u03b9 \u03c4\u03b7 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1 \u03bb\u03ae\u03c8\u03b7\u03c2 backup \u03b1\u03c0\u03cc \u03ac\u03bb\u03bb\u03bf site, \u03b4\u03b7\u03bb\u03b1\u03b4\u03ae \u03ad\u03c7\u03bf\u03c5\u03bd <strong>\u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03ae\u03c3\u03b5\u03b9 \u201cgenerated key\u201d<\/strong> \u03c3\u03c4\u03b9\u03c2 \u03c1\u03c5\u03b8\u03bc\u03af\u03c3\u03b5\u03b9\u03c2 \u03c4\u03bf\u03c5 plugin. \u0397 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1 \u03b1\u03c5\u03c4\u03ae \u03b5\u03af\u03bd\u03b1\u03b9 <strong>\u03b1\u03c0\u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03b7\u03bc\u03ad\u03bd\u03b7 \u03b1\u03c0\u03cc \u03c0\u03c1\u03bf\u03b5\u03c0\u03b9\u03bb\u03bf\u03b3\u03ae<\/strong>, \u03ba\u03b1\u03b9 \u03c4\u03bf key \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03ad\u03c7\u03b5\u03b9 \u03b4\u03b9\u03ac\u03c1\u03ba\u03b5\u03b9\u03b1 \u03c4\u03bf \u03c0\u03bf\u03bb\u03cd <strong>24 \u03ce\u03c1\u03b5\u03c2<\/strong> (\u03bc\u03ad\u03b3\u03b9\u03c3\u03c4\u03bf expiration).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a4\u03b9 \u03b1\u03ba\u03c1\u03b9\u03b2\u03ce\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf \u03ba\u03b5\u03bd\u03cc (CVE-2026-1357) \u03ba\u03b1\u03b9 \u03c0\u03bf\u03b9\u03b5\u03c2 \u03b5\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2 \u03b5\u03c0\u03b7\u03c1\u03b5\u03ac\u03b6\u03b5\u03b9<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li>CVE: <strong>CVE-2026-1357<\/strong><\/li>\n\n\n<li>CVSS: <strong>9.8 (Critical)<\/strong><\/li>\n\n\n<li>\u0395\u03c0\u03b7\u03c1\u03b5\u03b1\u03b6\u03cc\u03bc\u03b5\u03bd\u03b5\u03c2 \u03b5\u03ba\u03b4\u03cc\u03c3\u03b5\u03b9\u03c2: <strong><= 0.9.123<\/strong><\/li>\n\n\n<li>\u0394\u03b9\u03bf\u03c1\u03b8\u03c9\u03bc\u03ad\u03bd\u03b7 \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7: <strong>0.9.124<\/strong><\/li>\n\n\n<li>\u03a3\u03c5\u03c3\u03c7\u03b5\u03c4\u03b9\u03b6\u03cc\u03bc\u03b5\u03bd\u03bf plugin\/slug: <strong>wpvivid-backuprestore<\/strong> (WPvivid Backup &#038; Migration \/ Migration, Backup, Staging)<\/li>\n\n\n<li>\u0395\u03af\u03b4\u03bf\u03c2: <strong>Unauthenticated Arbitrary File Upload<\/strong> \u03bc\u03b5 \u03b4\u03c5\u03bd\u03b1\u03c4\u03cc\u03c4\u03b7\u03c4\u03b1 <strong>Remote Code Execution<\/strong><\/li>\n\n<\/ul>\n\n\n\n<p>\u03a4\u03bf \u03c0\u03c1\u03b1\u03ba\u03c4\u03b9\u03ba\u03cc \u03c3\u03b5\u03bd\u03ac\u03c1\u03b9\u03bf \u03b5\u03c0\u03af\u03b8\u03b5\u03c3\u03b7\u03c2 \u03b5\u03af\u03bd\u03b1\u03b9 \u03ba\u03bb\u03b1\u03c3\u03b9\u03ba\u03cc \u03b3\u03b9\u03b1 file upload \u03b5\u03c5\u03c0\u03ac\u03b8\u03b5\u03b9\u03b5\u03c2: \u03bf \u03b5\u03c0\u03b9\u03c4\u03b9\u03b8\u03ad\u03bc\u03b5\u03bd\u03bf\u03c2 \u03ba\u03b1\u03c4\u03b1\u03c6\u03ad\u03c1\u03bd\u03b5\u03b9 \u03bd\u03b1 \u03b1\u03bd\u03b5\u03b2\u03ac\u03c3\u03b5\u03b9 \u03b1\u03c5\u03b8\u03b1\u03af\u03c1\u03b5\u03c4\u03bf \u03b1\u03c1\u03c7\u03b5\u03af\u03bf (\u03c0.\u03c7. \u03ad\u03bd\u03b1 <strong>PHP webshell<\/strong>) \u03c3\u03b5 directory \u03c0\u03bf\u03c5 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c0\u03c1\u03bf\u03c3\u03b2\u03ac\u03c3\u03b9\u03bc\u03bf \u03b1\u03c0\u03cc \u03c4\u03bf web. \u0388\u03c0\u03b5\u03b9\u03c4\u03b1 \u03c4\u03bf \u03ba\u03b1\u03bb\u03b5\u03af \u03bc\u03b5 HTTP request \u03ba\u03b1\u03b9 \u03b5\u03ba\u03c4\u03b5\u03bb\u03b5\u03af \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1 \u03c3\u03c4\u03bf\u03bd server.<\/p>\n\n\n\n<div class=\"wp-block-group callout callout-warning is-style-warning is-layout-flow wp-block-group-is-layout-flow\" style=\"border-width:1px;border-radius:8px;padding-top:1rem;padding-right:1.5rem;padding-bottom:1rem;padding-left:1.5rem\">\n\n<h4 class=\"wp-block-heading callout-title\">\u03a3\u03b7\u03bc\u03b5\u03af\u03c9\u03c3\u03b7 \u03b3\u03b9\u03b1 \u03c4\u03bf \u03c0\u03c1\u03b1\u03b3\u03bc\u03b1\u03c4\u03b9\u03ba\u03cc exposure<\/h4>\n\n\n<p>\u0397 \u03b5\u03ba\u03bc\u03b5\u03c4\u03ac\u03bb\u03bb\u03b5\u03c5\u03c3\u03b7 \u03c0\u03b5\u03c1\u03b9\u03b3\u03c1\u03ac\u03c6\u03b5\u03c4\u03b1\u03b9 \u03c9\u03c2 unauthenticated, \u03b1\u03bb\u03bb\u03ac \u03c4\u03bf advisory \u03c5\u03c0\u03bf\u03b3\u03c1\u03b1\u03bc\u03bc\u03af\u03b6\u03b5\u03b9 \u03cc\u03c4\u03b9 \u03c4\u03bf \u00ab\u03ba\u03c1\u03af\u03c3\u03b9\u03bc\u03bf\u00bb impact \u03b1\u03c6\u03bf\u03c1\u03ac \u03ba\u03c5\u03c1\u03af\u03c9\u03c2 \u03c0\u03b5\u03c1\u03b9\u03c0\u03c4\u03ce\u03c3\u03b5\u03b9\u03c2 \u03cc\u03c0\u03bf\u03c5 \u03ad\u03c7\u03b5\u03b9 \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03b7\u03b8\u03b5\u03af key \u03c3\u03c4\u03b9\u03c2 \u03c1\u03c5\u03b8\u03bc\u03af\u03c3\u03b5\u03b9\u03c2 \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03b5\u03c4\u03b1\u03b9 \u03c3\u03b5 \u03ac\u03bb\u03bb\u03bf site \u03bd\u03b1 \u03c3\u03c4\u03b5\u03af\u03bb\u03b5\u03b9 backup \u03c3\u03c4\u03bf \u03b4\u03b9\u03ba\u03cc \u03c3\u03bf\u03c5. \u0391\u03c5\u03c4\u03ae \u03b7 \u03b4\u03c5\u03bd\u03b1\u03c4\u03cc\u03c4\u03b7\u03c4\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 disabled by default \u03ba\u03b1\u03b9 \u03c4\u03bf expiration \u03c4\u03bf\u03c5 key \u03b4\u03b5\u03bd \u03be\u03b5\u03c0\u03b5\u03c1\u03bd\u03ac \u03c4\u03b9\u03c2 24 \u03ce\u03c1\u03b5\u03c2.<\/p>\n\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a0\u03ce\u03c2 \u201c\u03b4\u03ad\u03bd\u03b5\u03b9\u201d \u03c4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ac \u03b7 \u03b5\u03ba\u03bc\u03b5\u03c4\u03ac\u03bb\u03bb\u03b5\u03c5\u03c3\u03b7: crypto error handling + path traversal<\/h2>\n\n\n\n<p>\u0397 \u03c4\u03b5\u03c7\u03bd\u03b9\u03ba\u03ae \u03c1\u03af\u03b6\u03b1 \u03c4\u03bf\u03c5 \u03c0\u03c1\u03bf\u03b2\u03bb\u03ae\u03bc\u03b1\u03c4\u03bf\u03c2 (\u03cc\u03c0\u03c9\u03c2 \u03c0\u03b1\u03c1\u03bf\u03c5\u03c3\u03b9\u03ac\u03c3\u03c4\u03b7\u03ba\u03b5) \u03b5\u03af\u03bd\u03b1\u03b9 \u03ad\u03bd\u03b1\u03c2 \u03c3\u03c5\u03bd\u03b4\u03c5\u03b1\u03c3\u03bc\u03cc\u03c2 \u03b1\u03c0\u03cc \u03b4\u03cd\u03bf \u03b8\u03ad\u03bc\u03b1\u03c4\u03b1: (\u03b1) \u03c7\u03b5\u03b9\u03c1\u03b9\u03c3\u03bc\u03cc\u03c2 \u03c3\u03c6\u03ac\u03bb\u03bc\u03b1\u03c4\u03bf\u03c2 \u03c3\u03c4\u03b7 \u03b4\u03b9\u03b1\u03b4\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 RSA decryption \u03c0\u03bf\u03c5 \u03c4\u03b5\u03bb\u03b9\u03ba\u03ac \u03bf\u03b4\u03b7\u03b3\u03b5\u03af \u03c3\u03b5 \u03c0\u03c1\u03bf\u03b2\u03bb\u03ad\u03c8\u03b9\u03bc\u03bf \u03ba\u03bb\u03b5\u03b9\u03b4\u03af \u03b3\u03b9\u03b1 AES\/Rijndael, \u03ba\u03b1\u03b9 (\u03b2) \u03ad\u03bb\u03bb\u03b5\u03b9\u03c8\u03b7 \u03b1\u03c0\u03bf\u03bb\u03cd\u03bc\u03b1\u03bd\u03c3\u03b7\u03c2 (sanitization) \u03c4\u03bf\u03c5 path\/filename \u03cc\u03c4\u03b1\u03bd \u03b3\u03c1\u03ac\u03c6\u03bf\u03bd\u03c4\u03b1\u03b9 \u03c4\u03b1 uploaded \u03b1\u03c1\u03c7\u03b5\u03af\u03b1 \u03c3\u03c4\u03bf filesystem.<\/p>\n\n\n\n<p>\u03a4\u03bf WPvivid \u03ad\u03c7\u03b5\u03b9 \u03b4\u03c5\u03bd\u03b1\u03c4\u03cc\u03c4\u03b7\u03c4\u03b1 \u03bd\u03b1 <strong>\u03bb\u03ac\u03b2\u03b5\u03b9 backup \u03b1\u03c0\u03cc \u03ac\u03bb\u03bb\u03bf site<\/strong>. \u0391\u03c5\u03c4\u03cc \u03b3\u03af\u03bd\u03b5\u03c4\u03b1\u03b9 \u03bc\u03ad\u03c3\u03c9 handler \u03c0\u03bf\u03c5, \u03bc\u03b5 \u03b2\u03ac\u03c3\u03b7 \u03c4\u03b7\u03bd \u03b1\u03bd\u03ac\u03bb\u03c5\u03c3\u03b7, \u03c0\u03b5\u03c1\u03bd\u03ac \u03b1\u03c0\u03cc \u03c4\u03b7 \u03bc\u03ad\u03b8\u03bf\u03b4\u03bf <code>send_to_site()<\/code> (\u03c3\u03c4\u03b7\u03bd \u03ba\u03bb\u03ac\u03c3\u03b7 <code>WPvivid_Send_to_site<\/code>) \u03ba\u03b1\u03b9 \u03b1\u03be\u03b9\u03bf\u03c0\u03bf\u03b9\u03b5\u03af \u03ad\u03bd\u03b1 short-term key \u03c0\u03bf\u03c5 \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03b5\u03af\u03c4\u03b1\u03b9 \u03c3\u03c4\u03b9\u03c2 \u03c1\u03c5\u03b8\u03bc\u03af\u03c3\u03b5\u03b9\u03c2.<\/p>\n\n\n\n<p>\u03a3\u03c4\u03bf \u03ba\u03bf\u03bc\u03bc\u03ac\u03c4\u03b9 \u03c4\u03b7\u03c2 \u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03ac\u03c6\u03b7\u03c3\u03b7\u03c2\/\u03b1\u03c0\u03bf\u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03ac\u03c6\u03b7\u03c3\u03b7\u03c2, \u03b7 \u03b1\u03bb\u03c5\u03c3\u03af\u03b4\u03b1 (\u03c3\u03b5 \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf \u03bb\u03bf\u03b3\u03b9\u03ba\u03ae\u03c2) \u03ad\u03c7\u03b5\u03b9 \u03c9\u03c2 \u03b5\u03be\u03ae\u03c2:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li>\u03a4\u03bf plugin \u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03b5\u03b9 <code>wpvivid_content<\/code> (base64) \u03b1\u03c0\u03cc POST \u03ba\u03b1\u03b9 \u03c4\u03bf \u03c0\u03b5\u03c1\u03bd\u03ac \u03c3\u03b5 \u03b4\u03b9\u03b1\u03b4\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 decrypt \u03bc\u03ad\u03c3\u03c9 <code>decrypt_message()<\/code>.<\/li>\n\n\n<li>\u0397 <code>decrypt_message()<\/code> \u03b5\u03c0\u03b9\u03c7\u03b5\u03b9\u03c1\u03b5\u03af \u03bd\u03b1 \u03ba\u03ac\u03bd\u03b5\u03b9 RSA decrypt \u03b5\u03bd\u03cc\u03c2 session key (\u03bc\u03b5 \u03b2\u03ac\u03c3\u03b7 public\/private key pair).<\/li>\n\n\n<li>\u038c\u03c4\u03b1\u03bd \u03c4\u03bf RSA decrypt \u03b1\u03c0\u03bf\u03c4\u03c5\u03b3\u03c7\u03ac\u03bd\u03b5\u03b9, \u03b1\u03bd\u03c4\u03af \u03bd\u03b1 \u03c4\u03b5\u03c1\u03bc\u03b1\u03c4\u03af\u03c3\u03b5\u03b9 \u03c3\u03c9\u03c3\u03c4\u03ac, \u03c4\u03bf \u03b1\u03c0\u03bf\u03c4\u03ad\u03bb\u03b5\u03c3\u03bc\u03b1 \u03c4\u03bf\u03c5 decrypt \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 <code>false<\/code>.<\/li>\n\n\n<li>\u0391\u03c5\u03c4\u03cc \u03c4\u03bf <code>false<\/code> \u03c0\u03b5\u03c1\u03bd\u03b9\u03ad\u03c4\u03b1\u03b9 \u03c3\u03c4\u03b7 \u03b2\u03b9\u03b2\u03bb\u03b9\u03bf\u03b8\u03ae\u03ba\u03b7 \u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03ac\u03c6\u03b7\u03c3\u03b7\u03c2 (phpseclib \/ Rijndael\/AES initialization), \u03cc\u03c0\u03bf\u03c5 \u03b1\u03bd\u03c4\u03b9\u03bc\u03b5\u03c4\u03c9\u03c0\u03af\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c3\u03b1\u03bd string \u03b1\u03c0\u03cc null bytes, \u03ac\u03c1\u03b1 \u03c0\u03c1\u03bf\u03ba\u03cd\u03c0\u03c4\u03b5\u03b9 \u03ad\u03bd\u03b1 <strong>\u03c0\u03c1\u03bf\u03b2\u03bb\u03ad\u03c8\u03b9\u03bc\u03bf \u201cnull-byte key\u201d<\/strong>.<\/li>\n\n\n<li>\u039c\u03b5 \u03c0\u03c1\u03bf\u03b2\u03bb\u03ad\u03c8\u03b9\u03bc\u03bf \u03ba\u03bb\u03b5\u03b9\u03b4\u03af, \u03ad\u03bd\u03b1\u03c2 \u03b5\u03c0\u03b9\u03c4\u03b9\u03b8\u03ad\u03bc\u03b5\u03bd\u03bf\u03c2 \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03ae\u03c3\u03b5\u03b9 \u201c\u03ad\u03b3\u03ba\u03c5\u03c1\u03bf\u201d \u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03b1\u03c6\u03b7\u03bc\u03ad\u03bd\u03bf payload (\u03ae \u03ba\u03b1\u03bb\u03cd\u03c4\u03b5\u03c1\u03b1: payload \u03c0\u03bf\u03c5 \u03b8\u03b1 \u03b1\u03c0\u03bf\u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03b1\u03c6\u03b7\u03b8\u03b5\u03af \u03bc\u03b5 \u03c4\u03bf null-byte key).<\/li>\n\n\n<li>\u03a0\u03b1\u03c1\u03ac\u03bb\u03bb\u03b7\u03bb\u03b1, \u03c4\u03bf plugin \u03b4\u03ad\u03c7\u03b5\u03c4\u03b1\u03b9 filename \u03b1\u03c0\u03cc \u03c4\u03bf \u03b1\u03c0\u03bf\u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03b1\u03c6\u03b7\u03bc\u03ad\u03bd\u03bf payload \u03c7\u03c9\u03c1\u03af\u03c2 \u03b5\u03c0\u03b1\u03c1\u03ba\u03ad\u03c2 sanitization, \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03bf\u03bd\u03c4\u03b1\u03c2 <strong>directory traversal<\/strong> \u03ce\u03c3\u03c4\u03b5 \u03bd\u03b1 \u03be\u03b5\u03c6\u03cd\u03b3\u03b5\u03b9 \u03b1\u03c0\u03cc \u03c4\u03bf\u03bd \u00ab\u03c0\u03c1\u03bf\u03c3\u03c4\u03b1\u03c4\u03b5\u03c5\u03bc\u03ad\u03bd\u03bf\u00bb backup \u03c6\u03ac\u03ba\u03b5\u03bb\u03bf.<\/li>\n\n\n<li>\u0388\u03c4\u03c3\u03b9 \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03b3\u03c1\u03b1\u03c6\u03c4\u03b5\u03af \u03b1\u03c5\u03b8\u03b1\u03af\u03c1\u03b5\u03c4\u03bf PHP \u03b1\u03c1\u03c7\u03b5\u03af\u03bf \u03c3\u03b5 web-accessible directory \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03b5\u03c0\u03b9\u03c4\u03b5\u03c5\u03c7\u03b8\u03b5\u03af RCE.<\/li>\n\n<\/ol>\n\n\n\n<p>\u0397 \u03b5\u03ba\u03bc\u03b5\u03c4\u03ac\u03bb\u03bb\u03b5\u03c5\u03c3\u03b7 \u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\u03b5\u03c4\u03b1\u03b9 \u03cc\u03c4\u03b9 \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03b3\u03af\u03bd\u03b5\u03b9 \u03bc\u03ad\u03c3\u03c9 \u03c0\u03b1\u03c1\u03b1\u03bc\u03ad\u03c4\u03c1\u03bf\u03c5\/\u03b5\u03bd\u03ad\u03c1\u03b3\u03b5\u03b9\u03b1\u03c2 <code>wpvivid_action=send_to_site<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u0395\u03bd\u03b4\u03b5\u03b9\u03ba\u03c4\u03b9\u03ba\u03ac \u03c3\u03b7\u03bc\u03b5\u03af\u03b1 \u03ba\u03ce\u03b4\u03b9\u03ba\u03b1 \u03c0\u03bf\u03c5 \u03c3\u03c7\u03b5\u03c4\u03af\u03b6\u03bf\u03bd\u03c4\u03b1\u03b9 \u03bc\u03b5 \u03c4\u03bf flow<\/h3>\n\n\n\n<p>\u03a4\u03bf \u03c0\u03b1\u03c1\u03b1\u03ba\u03ac\u03c4\u03c9 \u03b1\u03c0\u03cc\u03c3\u03c0\u03b1\u03c3\u03bc\u03b1 (\u03cc\u03c0\u03c9\u03c2 \u03c0\u03b1\u03c1\u03bf\u03c5\u03c3\u03b9\u03ac\u03c3\u03c4\u03b7\u03ba\u03b5) \u03b4\u03b5\u03af\u03c7\u03bd\u03b5\u03b9 \u03c4\u03bf flow \u03c3\u03c4\u03b7 <code>send_to_site()<\/code> \u03cc\u03c0\u03bf\u03c5 \u03b4\u03b9\u03b1\u03b2\u03ac\u03b6\u03b5\u03c4\u03b1\u03b9 \u03c4\u03bf token\/option, \u03b3\u03af\u03bd\u03b5\u03c4\u03b1\u03b9 decode \u03c4\u03bf\u03c5 POST body \u03ba\u03b1\u03b9 \u03ba\u03b1\u03bb\u03b5\u03af\u03c4\u03b1\u03b9 \u03c4\u03bf decrypt:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#24292e\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#e1e4e8;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>public function send_to_site()\n{\n    include_once WPVIVID_PLUGIN_DIR . '\/includes\/class-wpvivid-crypt.php';\n    $test_log = new WPvivid_Log();\n    $test_log-&gt;CreateLogFile('test_backup','no_folder','transfer');\n    $test_log-&gt;WriteLog('test upload.','notice');\n\n    try\n    {\n        if(isset($_POST['wpvivid_content']))\n        {\n            global $wpvivid_plugin;\n            $wpvivid_plugin-&gt;wpvivid_log = new WPvivid_Log();\n\n            $default = array();\n            $option = get_option('wpvivid_api_token',$default);\n            if(empty($option))\n            {\n                die();\n            }\n\n            if($option['expires'] != 0 &amp;&amp; $option['expires'] &lt; time())\n            {\n                die();\n            }\n\n            $crypt = new WPvivid_crypt(base64_decode($option['private_key']));\n            $body  = base64_decode($_POST['wpvivid_content']);\n            $data  = $crypt-&gt;decrypt_message($body);\n        }\n    }\n    catch(Exception $e)\n    {\n        \/\/ ...\n    }\n}\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki github-dark\" style=\"background-color:#24292e;color:#e1e4e8\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#F97583\">public<\/span><span style=\"color:#F97583\"> function<\/span><span style=\"color:#B392F0\"> send_to_site<\/span><span style=\"color:#E1E4E8\">()<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">    include_once<\/span><span style=\"color:#79B8FF\"> WPVIVID_PLUGIN_DIR<\/span><span style=\"color:#F97583\"> .<\/span><span style=\"color:#9ECBFF\"> '\/includes\/class-wpvivid-crypt.php'<\/span><span style=\"color:#E1E4E8\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $test_log <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#F97583\"> new<\/span><span style=\"color:#79B8FF\"> WPvivid_Log<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $test_log<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">CreateLogFile<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#9ECBFF\">'test_backup'<\/span><span style=\"color:#E1E4E8\">,<\/span><span style=\"color:#9ECBFF\">'no_folder'<\/span><span style=\"color:#E1E4E8\">,<\/span><span style=\"color:#9ECBFF\">'transfer'<\/span><span style=\"color:#E1E4E8\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $test_log<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">WriteLog<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#9ECBFF\">'test upload.'<\/span><span style=\"color:#E1E4E8\">,<\/span><span style=\"color:#9ECBFF\">'notice'<\/span><span style=\"color:#E1E4E8\">);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">    try<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">        if<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#79B8FF\">isset<\/span><span style=\"color:#E1E4E8\">($_POST[<\/span><span style=\"color:#9ECBFF\">'wpvivid_content'<\/span><span style=\"color:#E1E4E8\">]))<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">        {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">            global<\/span><span style=\"color:#E1E4E8\"> $wpvivid_plugin;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            $wpvivid_plugin<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#E1E4E8\">wpvivid_log <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#F97583\"> new<\/span><span style=\"color:#79B8FF\"> WPvivid_Log<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            $default <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> array<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            $option <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#B392F0\"> get_option<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#9ECBFF\">'wpvivid_api_token'<\/span><span style=\"color:#E1E4E8\">,$default);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">            if<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#79B8FF\">empty<\/span><span style=\"color:#E1E4E8\">($option))<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">                die<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">            if<\/span><span style=\"color:#E1E4E8\">($option[<\/span><span style=\"color:#9ECBFF\">'expires'<\/span><span style=\"color:#E1E4E8\">] <\/span><span style=\"color:#F97583\">!=<\/span><span style=\"color:#79B8FF\"> 0<\/span><span style=\"color:#F97583\"> &#x26;&#x26;<\/span><span style=\"color:#E1E4E8\"> $option[<\/span><span style=\"color:#9ECBFF\">'expires'<\/span><span style=\"color:#E1E4E8\">] <\/span><span style=\"color:#F97583\">&#x3C;<\/span><span style=\"color:#79B8FF\"> time<\/span><span style=\"color:#E1E4E8\">())<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">                die<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            $crypt <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#F97583\"> new<\/span><span style=\"color:#79B8FF\"> WPvivid_crypt<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#79B8FF\">base64_decode<\/span><span style=\"color:#E1E4E8\">($option[<\/span><span style=\"color:#9ECBFF\">'private_key'<\/span><span style=\"color:#E1E4E8\">]));<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            $body  <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> base64_decode<\/span><span style=\"color:#E1E4E8\">($_POST[<\/span><span style=\"color:#9ECBFF\">'wpvivid_content'<\/span><span style=\"color:#E1E4E8\">]);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">            $data  <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#E1E4E8\"> $crypt<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">decrypt_message<\/span><span style=\"color:#E1E4E8\">($body);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">        }<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    }<\/span><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">    catch<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#79B8FF\">Exception<\/span><span style=\"color:#E1E4E8\"> $e)<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#6A737D\">        \/\/ ...<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    }<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>\u03a4\u03bf \u03ba\u03c1\u03af\u03c3\u03b9\u03bc\u03bf \u03c3\u03b7\u03bc\u03b5\u03af\u03bf \u03b5\u03af\u03bd\u03b1\u03b9 \u03cc\u03c4\u03b9 \u03c4\u03bf RSA decrypt \u03b1\u03c0\u03bf\u03c4\u03c5\u03b3\u03c7\u03ac\u03bd\u03b5\u03b9 \u03ba\u03b1\u03b9 \u03b5\u03c0\u03b9\u03c3\u03c4\u03c1\u03ad\u03c6\u03b5\u03b9 <code>false<\/code>, \u03ba\u03b1\u03b9 \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf <code>false<\/code> \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03c6\u03c4\u03ac\u03c3\u03b5\u03b9 \u03bd\u03b1 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b7\u03b8\u03b5\u03af \u03c9\u03c2 key \u03c3\u03c4\u03bf Rijndael\/AES:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#24292e\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#e1e4e8;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>public function decrypt_message($message)\n{\n    $len = substr($message, 0, 3);\n    $len = hexdec($len);\n    $key = substr($message, 3, $len);\n\n    $cipherlen = substr($message, ($len + 3), 16);\n    $cipherlen = hexdec($cipherlen);\n\n    $data = substr($message, ($len + 19), $cipherlen);\n\n    $rsa = new Crypt_RSA();\n    $rsa-&gt;loadKey($this-&gt;public_key);\n    $key = $rsa-&gt;decrypt($key);\n\n    $rij = new Crypt_Rijndael();\n    $rij-&gt;setKey($key);\n\n    return $rij-&gt;decrypt($data);\n}\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki github-dark\" style=\"background-color:#24292e;color:#e1e4e8\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#F97583\">public<\/span><span style=\"color:#F97583\"> function<\/span><span style=\"color:#B392F0\"> decrypt_message<\/span><span style=\"color:#E1E4E8\">($message)<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $len <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> substr<\/span><span style=\"color:#E1E4E8\">($message, <\/span><span style=\"color:#79B8FF\">0<\/span><span style=\"color:#E1E4E8\">, <\/span><span style=\"color:#79B8FF\">3<\/span><span style=\"color:#E1E4E8\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $len <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> hexdec<\/span><span style=\"color:#E1E4E8\">($len);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $key <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> substr<\/span><span style=\"color:#E1E4E8\">($message, <\/span><span style=\"color:#79B8FF\">3<\/span><span style=\"color:#E1E4E8\">, $len);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $cipherlen <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> substr<\/span><span style=\"color:#E1E4E8\">($message, ($len <\/span><span style=\"color:#F97583\">+<\/span><span style=\"color:#79B8FF\"> 3<\/span><span style=\"color:#E1E4E8\">), <\/span><span style=\"color:#79B8FF\">16<\/span><span style=\"color:#E1E4E8\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $cipherlen <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> hexdec<\/span><span style=\"color:#E1E4E8\">($cipherlen);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $data <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> substr<\/span><span style=\"color:#E1E4E8\">($message, ($len <\/span><span style=\"color:#F97583\">+<\/span><span style=\"color:#79B8FF\"> 19<\/span><span style=\"color:#E1E4E8\">), $cipherlen);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $rsa <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#F97583\"> new<\/span><span style=\"color:#79B8FF\"> Crypt_RSA<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $rsa<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">loadKey<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#79B8FF\">$this<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#E1E4E8\">public_key);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $key <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#E1E4E8\"> $rsa<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">decrypt<\/span><span style=\"color:#E1E4E8\">($key);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $rij <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#F97583\"> new<\/span><span style=\"color:#79B8FF\"> Crypt_Rijndael<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $rij<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">setKey<\/span><span style=\"color:#E1E4E8\">($key);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">    return<\/span><span style=\"color:#E1E4E8\"> $rij<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">decrypt<\/span><span style=\"color:#E1E4E8\">($data);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>\u03a3\u03cd\u03bc\u03c6\u03c9\u03bd\u03b1 \u03bc\u03b5 \u03c4\u03b7\u03bd \u03c0\u03b5\u03c1\u03b9\u03b3\u03c1\u03b1\u03c6\u03ae, \u03bf \u03c3\u03c5\u03bd\u03b4\u03c5\u03b1\u03c3\u03bc\u03cc\u03c2 \u00ab\u03bc\u03b7 \u03c4\u03b5\u03c1\u03bc\u03b1\u03c4\u03b9\u03c3\u03bc\u03bf\u03cd\u00bb \u03c3\u03b5 decrypt failure \u03ba\u03b1\u03b9 \u03c4\u03bf\u03c5 \u03c4\u03c1\u03cc\u03c0\u03bf\u03c5 \u03c0\u03bf\u03c5 \u03b7 \u03b2\u03b9\u03b2\u03bb\u03b9\u03bf\u03b8\u03ae\u03ba\u03b7 \u03b1\u03bd\u03c4\u03b9\u03bc\u03b5\u03c4\u03c9\u03c0\u03af\u03b6\u03b5\u03b9 \u03c4\u03bf <code>false<\/code> (\u03c3\u03b1\u03bd null bytes) \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03b5\u03b9 \u03c3\u03c4\u03bf\u03bd \u03b5\u03c0\u03b9\u03c4\u03b9\u03b8\u03ad\u03bc\u03b5\u03bd\u03bf \u03bd\u03b1 \u03ba\u03b1\u03c4\u03b1\u03c3\u03ba\u03b5\u03c5\u03ac\u03c3\u03b5\u03b9 \u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03b1\u03c6\u03b7\u03bc\u03ad\u03bd\u03bf \u03c0\u03b5\u03c1\u03b9\u03b5\u03c7\u03cc\u03bc\u03b5\u03bd\u03bf \u03bc\u03b5 \u03c0\u03c1\u03bf\u03b2\u03bb\u03ad\u03c8\u03b9\u03bc\u03bf \u03ba\u03bb\u03b5\u03b9\u03b4\u03af.<\/p>\n\n\n\n<p>\u03a4\u03bf \u03b4\u03b5\u03cd\u03c4\u03b5\u03c1\u03bf \u03ba\u03bf\u03bc\u03bc\u03ac\u03c4\u03b9 \u03b5\u03af\u03bd\u03b1\u03b9 \u03cc\u03c4\u03b9 \u03c4\u03b1 filenames \u03b1\u03c0\u03cc \u03c4\u03bf \u03b1\u03c0\u03bf\u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03b1\u03c6\u03b7\u03bc\u03ad\u03bd\u03bf payload \u03b4\u03b5\u03bd \u03ba\u03b1\u03b8\u03b1\u03c1\u03af\u03b6\u03bf\u03bd\u03c4\u03b1\u03bd \u03c3\u03c9\u03c3\u03c4\u03ac, \u03b1\u03bd\u03bf\u03af\u03b3\u03bf\u03bd\u03c4\u03b1\u03c2 \u03c7\u03ce\u03c1\u03bf \u03b3\u03b9\u03b1 directory traversal, \u03ac\u03c1\u03b1 \u03b3\u03b9\u03b1 \u03b5\u03b3\u03b3\u03c1\u03b1\u03c6\u03ae \u03b1\u03c1\u03c7\u03b5\u03af\u03c9\u03bd \u03b5\u03ba\u03c4\u03cc\u03c2 \u03c4\u03bf\u03c5 backup directory.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a4\u03b9 \u03ac\u03bb\u03bb\u03b1\u03be\u03b5 \u03c3\u03c4\u03bf patch (0.9.124): \u03ad\u03bb\u03b5\u03b3\u03c7\u03bf\u03c2 \u03ba\u03bb\u03b5\u03b9\u03b4\u03b9\u03bf\u03cd + \u03ad\u03bb\u03b5\u03b3\u03c7\u03bf\u03c2 extensions<\/h2>\n\n\n\n<p>\u0397 \u03b4\u03b9\u03cc\u03c1\u03b8\u03c9\u03c3\u03b7 \u03ad\u03b3\u03b9\u03bd\u03b5 \u03c3\u03b5 \u03b4\u03cd\u03bf \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03b1:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li>\u03a0\u03c1\u03bf\u03c3\u03c4\u03ad\u03b8\u03b7\u03ba\u03b5 \u03ad\u03bb\u03b5\u03b3\u03c7\u03bf\u03c2 \u03ce\u03c3\u03c4\u03b5, \u03b1\u03bd \u03c4\u03bf RSA-decrypted <code>$key<\/code> \u03b5\u03af\u03bd\u03b1\u03b9 <code>false<\/code> \u03ae \u03ba\u03b5\u03bd\u03cc, \u03bd\u03b1 \u03b5\u03c0\u03b9\u03c3\u03c4\u03c1\u03ad\u03c6\u03b5\u03b9 <code>false<\/code> \u03ba\u03b1\u03b9 \u03bd\u03b1 \u03bc\u03b7\u03bd \u03c3\u03c5\u03bd\u03b5\u03c7\u03af\u03b6\u03b5\u03b9 \u03b7 \u03b1\u03c0\u03bf\u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03ac\u03c6\u03b7\u03c3\u03b7 \u03bc\u03b5 \u00ab\u03c4\u03c5\u03c7\u03b1\u03af\u03bf\/\u03c0\u03c1\u03bf\u03b2\u03bb\u03ad\u03c8\u03b9\u03bc\u03bf\u00bb \u03ba\u03bb\u03b5\u03b9\u03b4\u03af.<\/li>\n\n\n<li>\u03a0\u03c1\u03bf\u03c3\u03c4\u03ad\u03b8\u03b7\u03ba\u03b5 \u03ad\u03bb\u03b5\u03b3\u03c7\u03bf\u03c2 \u03b5\u03c0\u03ad\u03ba\u03c4\u03b1\u03c3\u03b7\u03c2 \u03b1\u03c1\u03c7\u03b5\u03af\u03bf\u03c5 \u03c3\u03c4\u03b7\u03bd <code>send_to_site()<\/code> \u03ce\u03c3\u03c4\u03b5 \u03bd\u03b1 \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03bf\u03bd\u03c4\u03b1\u03b9 \u03bc\u03cc\u03bd\u03bf backup-related \u03c4\u03cd\u03c0\u03bf\u03b9.<\/li>\n\n<\/ol>\n\n\n\n<p>\u03a4\u03bf patch \u03c3\u03c4\u03bf <code>decrypt_message()<\/code> \u03cc\u03c0\u03c9\u03c2 \u03c0\u03b1\u03c1\u03bf\u03c5\u03c3\u03b9\u03ac\u03c3\u03c4\u03b7\u03ba\u03b5:<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#24292e\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#e1e4e8;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>public function decrypt_message($message)\n{\n    $len = substr($message, 0, 3);\n    $len = hexdec($len);\n    $key = substr($message, 3, $len);\n\n    $cipherlen = substr($message, ($len + 3), 16);\n    $cipherlen = hexdec($cipherlen);\n\n    $data = substr($message, ($len + 19), $cipherlen);\n\n    $rsa = new Crypt_RSA();\n    $rsa-&gt;loadKey($this-&gt;public_key);\n    $key = $rsa-&gt;decrypt($key);\n\n    if ($key === false || empty($key))\n    {\n        return false;\n    }\n\n    $rij = new Crypt_Rijndael();\n    $rij-&gt;setKey($key);\n\n    return $rij-&gt;decrypt($data);\n}\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki github-dark\" style=\"background-color:#24292e;color:#e1e4e8\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#F97583\">public<\/span><span style=\"color:#F97583\"> function<\/span><span style=\"color:#B392F0\"> decrypt_message<\/span><span style=\"color:#E1E4E8\">($message)<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $len <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> substr<\/span><span style=\"color:#E1E4E8\">($message, <\/span><span style=\"color:#79B8FF\">0<\/span><span style=\"color:#E1E4E8\">, <\/span><span style=\"color:#79B8FF\">3<\/span><span style=\"color:#E1E4E8\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $len <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> hexdec<\/span><span style=\"color:#E1E4E8\">($len);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $key <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> substr<\/span><span style=\"color:#E1E4E8\">($message, <\/span><span style=\"color:#79B8FF\">3<\/span><span style=\"color:#E1E4E8\">, $len);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $cipherlen <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> substr<\/span><span style=\"color:#E1E4E8\">($message, ($len <\/span><span style=\"color:#F97583\">+<\/span><span style=\"color:#79B8FF\"> 3<\/span><span style=\"color:#E1E4E8\">), <\/span><span style=\"color:#79B8FF\">16<\/span><span style=\"color:#E1E4E8\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $cipherlen <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> hexdec<\/span><span style=\"color:#E1E4E8\">($cipherlen);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $data <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> substr<\/span><span style=\"color:#E1E4E8\">($message, ($len <\/span><span style=\"color:#F97583\">+<\/span><span style=\"color:#79B8FF\"> 19<\/span><span style=\"color:#E1E4E8\">), $cipherlen);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $rsa <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#F97583\"> new<\/span><span style=\"color:#79B8FF\"> Crypt_RSA<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $rsa<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">loadKey<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#79B8FF\">$this<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#E1E4E8\">public_key);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $key <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#E1E4E8\"> $rsa<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">decrypt<\/span><span style=\"color:#E1E4E8\">($key);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">    if<\/span><span style=\"color:#E1E4E8\"> ($key <\/span><span style=\"color:#F97583\">===<\/span><span style=\"color:#79B8FF\"> false<\/span><span style=\"color:#F97583\"> ||<\/span><span style=\"color:#79B8FF\"> empty<\/span><span style=\"color:#E1E4E8\">($key))<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    {<\/span><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">        return<\/span><span style=\"color:#79B8FF\"> false<\/span><span style=\"color:#E1E4E8\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    }<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $rij <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#F97583\"> new<\/span><span style=\"color:#79B8FF\"> Crypt_Rijndael<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $rij<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">setKey<\/span><span style=\"color:#E1E4E8\">($key);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">    return<\/span><span style=\"color:#E1E4E8\"> $rij<\/span><span style=\"color:#F97583\">-><\/span><span style=\"color:#B392F0\">decrypt<\/span><span style=\"color:#E1E4E8\">($data);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p>\u039a\u03b1\u03b9 \u03bf \u03ad\u03bb\u03b5\u03b3\u03c7\u03bf\u03c2 \u03b5\u03c0\u03ad\u03ba\u03c4\u03b1\u03c3\u03b7\u03c2 \u03c0\u03bf\u03c5 \u03c0\u03c1\u03bf\u03c3\u03c4\u03ad\u03b8\u03b7\u03ba\u03b5 \u03c3\u03c4\u03b7 <code>send_to_site()<\/code> (\u03bc\u03b5 <code>basename()<\/code>, <code>preg_replace()<\/code> \u03b3\u03b9\u03b1 safe filename \u03ba\u03b1\u03b9 allowlist extensions):<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#24292e\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#e1e4e8;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>$safe_name = basename($params['name']);\n$safe_name = preg_replace('\/[^a-zA-Z0-9._-]\/', '', $safe_name);\n\n$allowed_extensions = array('zip', 'gz', 'tar', 'sql');\n$file_ext = strtolower(pathinfo($safe_name, PATHINFO_EXTENSION));\n\nif (!in_array($file_ext, $allowed_extensions, true))\n{\n    $ret['result'] = WPVIVID_FAILED;\n    $ret['error']  = 'Invalid file type - only backup files allowed.';\n    echo wp_json_encode($ret);\n    die();\n}\n<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki github-dark\" style=\"background-color:#24292e;color:#e1e4e8\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color:#E1E4E8\">$safe_name <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> basename<\/span><span style=\"color:#E1E4E8\">($params[<\/span><span style=\"color:#9ECBFF\">'name'<\/span><span style=\"color:#E1E4E8\">]);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">$safe_name <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> preg_replace<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#9ECBFF\">'\/<\/span><span style=\"color:#DBEDFF\">[^a-zA-Z0-9._-]<\/span><span style=\"color:#9ECBFF\">\/'<\/span><span style=\"color:#E1E4E8\">, <\/span><span style=\"color:#9ECBFF\">''<\/span><span style=\"color:#E1E4E8\">, $safe_name);<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">$allowed_extensions <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> array<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#9ECBFF\">'zip'<\/span><span style=\"color:#E1E4E8\">, <\/span><span style=\"color:#9ECBFF\">'gz'<\/span><span style=\"color:#E1E4E8\">, <\/span><span style=\"color:#9ECBFF\">'tar'<\/span><span style=\"color:#E1E4E8\">, <\/span><span style=\"color:#9ECBFF\">'sql'<\/span><span style=\"color:#E1E4E8\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">$file_ext <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> strtolower<\/span><span style=\"color:#E1E4E8\">(<\/span><span style=\"color:#79B8FF\">pathinfo<\/span><span style=\"color:#E1E4E8\">($safe_name, <\/span><span style=\"color:#79B8FF\">PATHINFO_EXTENSION<\/span><span style=\"color:#E1E4E8\">));<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">if<\/span><span style=\"color:#E1E4E8\"> (<\/span><span style=\"color:#F97583\">!<\/span><span style=\"color:#79B8FF\">in_array<\/span><span style=\"color:#E1E4E8\">($file_ext, $allowed_extensions, <\/span><span style=\"color:#79B8FF\">true<\/span><span style=\"color:#E1E4E8\">))<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $ret[<\/span><span style=\"color:#9ECBFF\">'result'<\/span><span style=\"color:#E1E4E8\">] <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#79B8FF\"> WPVIVID_FAILED<\/span><span style=\"color:#E1E4E8\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">    $ret[<\/span><span style=\"color:#9ECBFF\">'error'<\/span><span style=\"color:#E1E4E8\">]  <\/span><span style=\"color:#F97583\">=<\/span><span style=\"color:#9ECBFF\"> 'Invalid file type - only backup files allowed.'<\/span><span style=\"color:#E1E4E8\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color:#79B8FF\">    echo<\/span><span style=\"color:#B392F0\"> wp_json_encode<\/span><span style=\"color:#E1E4E8\">($ret);<\/span><\/span>\n<span class=\"line\"><span style=\"color:#F97583\">    die<\/span><span style=\"color:#E1E4E8\">();<\/span><\/span>\n<span class=\"line\"><span style=\"color:#E1E4E8\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a0\u03bf\u03b9\u03bf\u03c2 \u03ba\u03b9\u03bd\u03b4\u03c5\u03bd\u03b5\u03cd\u03b5\u03b9 \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03bf (\u03ba\u03b1\u03b9 \u03b3\u03b9\u03b1\u03c4\u03af \u03ad\u03c7\u03b5\u03b9 \u03c3\u03b7\u03bc\u03b1\u03c3\u03af\u03b1 \u03c4\u03bf generated key)<\/h2>\n\n\n\n<p>\u03a4\u03bf advisory \u03b5\u03c0\u03b9\u03bc\u03ad\u03bd\u03b5\u03b9 \u03c3\u03c4\u03bf operational detail: \u03b7 \u03b5\u03c0\u03af\u03b8\u03b5\u03c3\u03b7 \u00ab\u03b4\u03ad\u03bd\u03b5\u03b9\u00bb \u03c0\u03ac\u03bd\u03c9 \u03c3\u03c4\u03b7 \u03c1\u03bf\u03ae \u03bb\u03ae\u03c8\u03b7\u03c2 backup \u03b1\u03c0\u03cc \u03ac\u03bb\u03bb\u03bf site. \u0394\u03b7\u03bb\u03b1\u03b4\u03ae, \u03b1\u03bd \u03ad\u03c7\u03b5\u03b9\u03c2 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03b5\u03b9 \u03c4\u03b7 \u03b4\u03c5\u03bd\u03b1\u03c4\u03cc\u03c4\u03b7\u03c4\u03b1 \u03bd\u03b1 \u03c3\u03c4\u03b5\u03af\u03bb\u03b5\u03b9 \u03ad\u03bd\u03b1 \u03ac\u03bb\u03bb\u03bf site backup \u03c3\u03c4\u03bf \u03b4\u03b9\u03ba\u03cc \u03c3\u03bf\u03c5, \u03b8\u03b1 \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03ae\u03c3\u03b5\u03b9\u03c2 \u03ad\u03bd\u03b1 key \u03c3\u03c4\u03b9\u03c2 \u03c1\u03c5\u03b8\u03bc\u03af\u03c3\u03b5\u03b9\u03c2. \u0391\u03c5\u03c4\u03cc \u03c4\u03bf key \u03b5\u03af\u03bd\u03b1\u03b9 \u03c7\u03c1\u03bf\u03bd\u03b9\u03ba\u03ac \u03c0\u03b5\u03c1\u03b9\u03bf\u03c1\u03b9\u03c3\u03bc\u03ad\u03bd\u03bf (\u03ad\u03c9\u03c2 24 \u03ce\u03c1\u03b5\u03c2), \u03cc\u03bc\u03c9\u03c2 \u03b1\u03c1\u03ba\u03b5\u03af \u03bd\u03b1 \u03c5\u03c0\u03ac\u03c1\u03c7\u03b5\u03b9 \u03b5\u03bd\u03b5\u03c1\u03b3\u03cc \u03c0\u03b1\u03c1\u03ac\u03b8\u03c5\u03c1\u03bf \u03cc\u03c0\u03bf\u03c5 \u03bf endpoint \u03b4\u03ad\u03c7\u03b5\u03c4\u03b1\u03b9 \u03c4\u03ad\u03c4\u03bf\u03b9\u03bf\u03c5 \u03c4\u03cd\u03c0\u03bf\u03c5 \u03b1\u03b9\u03c4\u03ae\u03bc\u03b1\u03c4\u03b1.<\/p>\n\n\n\n<p>\u03a3\u03b5 \u03c0\u03c1\u03b1\u03ba\u03c4\u03b9\u03ba\u03cc \u03b5\u03c0\u03af\u03c0\u03b5\u03b4\u03bf, \u03b1\u03c5\u03c4\u03cc \u03c3\u03b7\u03bc\u03b1\u03af\u03bd\u03b5\u03b9 \u03cc\u03c4\u03b9 \u03b4\u03cd\u03bf sites \u03bc\u03b5 \u03af\u03b4\u03b9\u03bf plugin \u03b4\u03b5\u03bd \u03ad\u03c7\u03bf\u03c5\u03bd \u03af\u03b4\u03b9\u03bf \u03c1\u03af\u03c3\u03ba\u03bf: \u03ad\u03bd\u03b1 \u03c0\u03bf\u03c5 \u03b1\u03c0\u03bb\u03ce\u03c2 \u03ba\u03ac\u03bd\u03b5\u03b9 \u03c4\u03bf\u03c0\u03b9\u03ba\u03ac backups (\u03c7\u03c9\u03c1\u03af\u03c2 send\/receive) \u03ad\u03c7\u03b5\u03b9 \u03bc\u03b9\u03ba\u03c1\u03cc\u03c4\u03b5\u03c1\u03bf exposure \u03c3\u03b5 \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf \u03c3\u03c5\u03b3\u03ba\u03b5\u03ba\u03c1\u03b9\u03bc\u03ad\u03bd\u03bf vector, \u03c3\u03b5 \u03c3\u03c7\u03ad\u03c3\u03b7 \u03bc\u03b5 \u03ad\u03bd\u03b1 \u03c0\u03bf\u03c5 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af \u03b5\u03bd\u03b5\u03c1\u03b3\u03ac \u03c4\u03b7\u03bd \u201csend backup to site\u201d \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a4\u03b9 \u03c0\u03c1\u03ad\u03c0\u03b5\u03b9 \u03bd\u03b1 \u03ba\u03ac\u03bd\u03b5\u03b9\u03c2 \u03c4\u03ce\u03c1\u03b1 (checklist \u03b3\u03b9\u03b1 developers\/ops)<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n\n<li>\u0388\u03bb\u03b5\u03b3\u03be\u03b5 \u03b1\u03bd \u03c4\u03bf plugin \u03b5\u03af\u03bd\u03b1\u03b9 \u03b5\u03b3\u03ba\u03b1\u03c4\u03b5\u03c3\u03c4\u03b7\u03bc\u03ad\u03bd\u03bf: <strong>WPvivid Backup &#038; Migration<\/strong> (slug: <code>wpvivid-backuprestore<\/code>).<\/li>\n\n\n<li>\u0395\u03c0\u03b9\u03b2\u03b5\u03b2\u03b1\u03af\u03c9\u03c3\u03b5 \u03c4\u03b7\u03bd \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7. \u0391\u03bd \u03b5\u03af\u03bd\u03b1\u03b9 <strong>0.9.123 \u03ae \u03c0\u03b1\u03bb\u03b1\u03b9\u03cc\u03c4\u03b5\u03c1\u03b7<\/strong>, \u03b8\u03b5\u03c9\u03c1\u03b5\u03af\u03c4\u03b1\u03b9 \u03b5\u03c5\u03ac\u03bb\u03c9\u03c4\u03b7.<\/li>\n\n\n<li>\u039a\u03ac\u03bd\u03b5 \u03ac\u03bc\u03b5\u03c3\u03bf update \u03c3\u03c4\u03b7 \u03b4\u03b9\u03bf\u03c1\u03b8\u03c9\u03bc\u03ad\u03bd\u03b7 \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7 <strong>0.9.124<\/strong> (\u03cc\u03c0\u03c9\u03c2 \u03b1\u03bd\u03b1\u03c6\u03ad\u03c1\u03b5\u03c4\u03b1\u03b9 \u03c3\u03c4\u03bf advisory, \u03b1\u03c5\u03c4\u03ae \u03b5\u03af\u03bd\u03b1\u03b9 \u03b7 patched \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7 \u03c4\u03b7 \u03c3\u03c4\u03b9\u03b3\u03bc\u03ae \u03c4\u03b7\u03c2 \u03b4\u03b7\u03bc\u03bf\u03c3\u03af\u03b5\u03c5\u03c3\u03b7\u03c2).<\/li>\n\n\n<li>\u0391\u03bd \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03b5\u03af\u03c2 \u03c4\u03b7 \u03bb\u03b5\u03b9\u03c4\u03bf\u03c5\u03c1\u03b3\u03af\u03b1 \u03bb\u03ae\u03c8\u03b7\u03c2 backup \u03b1\u03c0\u03cc \u03ac\u03bb\u03bb\u03bf site, \u03ad\u03bb\u03b5\u03b3\u03be\u03b5 \u03b1\u03bd \u03c5\u03c0\u03ac\u03c1\u03c7\u03b5\u03b9 \u03b5\u03bd\u03b5\u03c1\u03b3\u03cc\/\u03c0\u03c1\u03cc\u03c3\u03c6\u03b1\u03c4\u03b1 \u03b5\u03bd\u03b5\u03c1\u03b3\u03cc generated key \u03ba\u03b1\u03b9 \u03c0\u03b5\u03c1\u03b9\u03cc\u03c1\u03b9\u03c3\u03b5 \u03c4\u03b7 \u03c7\u03c1\u03ae\u03c3\u03b7 \u03c4\u03b7\u03c2 \u03bc\u03cc\u03bd\u03bf \u03cc\u03c4\u03b1\u03bd \u03b5\u03af\u03bd\u03b1\u03b9 \u03b1\u03c0\u03b1\u03c1\u03b1\u03af\u03c4\u03b7\u03c4\u03b7.<\/li>\n\n\n<li>\u0391\u03bd \u03ad\u03c7\u03b5\u03b9\u03c2 Wordfence, \u03bb\u03ac\u03b2\u03b5 \u03c5\u03c0\u03cc\u03c8\u03b7 \u03cc\u03c4\u03b9 \u03bf\u03b9 \u03c7\u03c1\u03ae\u03c3\u03c4\u03b5\u03c2 <strong>Wordfence Premium \/ Care \/ Response<\/strong> \u03ad\u03bb\u03b1\u03b2\u03b1\u03bd firewall rule \u03c3\u03c4\u03b9\u03c2 <strong>22 \u0399\u03b1\u03bd\u03bf\u03c5\u03b1\u03c1\u03af\u03bf\u03c5 2026<\/strong>, \u03b5\u03bd\u03ce \u03bf\u03b9 \u03c7\u03c1\u03ae\u03c3\u03c4\u03b5\u03c2 <strong>Wordfence Free<\/strong> (\u03c3\u03cd\u03bc\u03c6\u03c9\u03bd\u03b1 \u03bc\u03b5 \u03c4\u03bf \u03c7\u03c1\u03bf\u03bd\u03bf\u03b4\u03b9\u03ac\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1) \u03b8\u03b1 \u03bb\u03ac\u03b2\u03bf\u03c5\u03bd \u03c4\u03b7\u03bd \u03af\u03b4\u03b9\u03b1 \u03c0\u03c1\u03bf\u03c3\u03c4\u03b1\u03c3\u03af\u03b1 \u03c3\u03c4\u03b9\u03c2 <strong>21 \u03a6\u03b5\u03b2\u03c1\u03bf\u03c5\u03b1\u03c1\u03af\u03bf\u03c5 2026<\/strong>.<\/li>\n\n<\/ol>\n\n\n\n<div class=\"wp-block-group callout callout-info is-style-info is-layout-flow wp-block-group-is-layout-flow\" style=\"border-width:1px;border-radius:8px;padding-top:1rem;padding-right:1.5rem;padding-bottom:1rem;padding-left:1.5rem\">\n\n<h4 class=\"wp-block-heading callout-title\">\u03a3\u03b7\u03bc\u03b5\u03af\u03c9\u03c3\u03b7 \u03b3\u03b9\u03b1 \u03c4\u03bf Wordfence firewall rule<\/h4>\n\n\n<p>\u03a4\u03bf firewall rule \u03b5\u03af\u03bd\u03b1\u03b9 \u03b5\u03c0\u03b9\u03c0\u03bb\u03ad\u03bf\u03bd \u03ac\u03bc\u03c5\u03bd\u03b1, \u03cc\u03c7\u03b9 \u03c5\u03c0\u03bf\u03ba\u03b1\u03c4\u03ac\u03c3\u03c4\u03b1\u03c4\u03bf \u03c4\u03bf\u03c5 update. \u0397 \u03bf\u03c5\u03c3\u03b9\u03b1\u03c3\u03c4\u03b9\u03ba\u03ae \u03b1\u03bd\u03c4\u03b9\u03bc\u03b5\u03c4\u03ce\u03c0\u03b9\u03c3\u03b7 \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf patch \u03c3\u03c4\u03b7\u03bd \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7 0.9.124.<\/p>\n\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Disclosure timeline (\u03cc\u03c0\u03c9\u03c2 \u03b4\u03b7\u03bc\u03bf\u03c3\u03b9\u03b5\u03cd\u03c4\u03b7\u03ba\u03b5)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><strong>January 12, 2026<\/strong> &#8211; \u03a5\u03c0\u03bf\u03b2\u03bb\u03ae\u03b8\u03b7\u03ba\u03b5 \u03b1\u03bd\u03b1\u03c6\u03bf\u03c1\u03ac \u03b3\u03b9\u03b1 Arbitrary File Upload \u03c3\u03c4\u03bf WPvivid Backup \u03bc\u03ad\u03c3\u03c9 \u03c4\u03bf\u03c5 Wordfence Bug Bounty Program.<\/li>\n\n\n<li><strong>January 22, 2026<\/strong> &#8211; \u0395\u03c0\u03b9\u03b2\u03b5\u03b2\u03b1\u03af\u03c9\u03c3\u03b7\/validation \u03ba\u03b1\u03b9 proof-of-concept exploit. \u0395\u03c0\u03b9\u03ba\u03bf\u03b9\u03bd\u03c9\u03bd\u03af\u03b1 \u03bc\u03b5 vendor \u03ba\u03b1\u03b9 \u03c0\u03c1\u03cc\u03c3\u03ba\u03bb\u03b7\u03c3\u03b7 \u03c7\u03c1\u03ae\u03c3\u03b7\u03c2 \u03c4\u03bf\u03c5 <a href=\"https:\/\/www.wordfence.com\/threat-intel\/vendor\/vulnerability-management-portal\/\">Wordfence Vulnerability Management Portal<\/a>.<\/li>\n\n\n<li><strong>January 22, 2026<\/strong> &#8211; Wordfence Premium\/Care\/Response \u03ad\u03bb\u03b1\u03b2\u03b1\u03bd firewall rule \u03b3\u03b9\u03b1 \u03c0\u03c1\u03bf\u03c3\u03c4\u03b1\u03c3\u03af\u03b1 \u03b1\u03c0\u03cc exploits \u03c0\u03bf\u03c5 \u03c3\u03c4\u03bf\u03c7\u03b5\u03cd\u03bf\u03c5\u03bd \u03c4\u03bf \u03ba\u03b5\u03bd\u03cc.<\/li>\n\n\n<li><strong>January 23, 2026<\/strong> &#8211; \u039f vendor \u03b1\u03c0\u03ac\u03bd\u03c4\u03b7\u03c3\u03b5 \u03ba\u03b1\u03b9 \u03b5\u03c0\u03ad\u03bb\u03b5\u03be\u03b5 email \u03b3\u03b9\u03b1 \u03c4\u03b7 \u03b4\u03b9\u03b1\u03b4\u03b9\u03ba\u03b1\u03c3\u03af\u03b1 disclosure.<\/li>\n\n\n<li><strong>January 23, 2026<\/strong> &#8211; \u0395\u03c3\u03c4\u03ac\u03bb\u03b7\u03c3\u03b1\u03bd \u03bf\u03b9 \u03c0\u03bb\u03ae\u03c1\u03b5\u03b9\u03c2 \u03bb\u03b5\u03c0\u03c4\u03bf\u03bc\u03ad\u03c1\u03b5\u03b9\u03b5\u03c2 \u03c3\u03c4\u03bf\u03bd vendor, \u03ad\u03b3\u03b9\u03bd\u03b5 \u03b1\u03c0\u03bf\u03b4\u03bf\u03c7\u03ae \u03c4\u03b7\u03c2 \u03b1\u03bd\u03b1\u03c6\u03bf\u03c1\u03ac\u03c2 \u03ba\u03b1\u03b9 \u03be\u03b5\u03ba\u03af\u03bd\u03b7\u03c3\u03b5 \u03b7 \u03b4\u03b9\u03cc\u03c1\u03b8\u03c9\u03c3\u03b7.<\/li>\n\n\n<li><strong>January 28, 2026<\/strong> &#8211; \u039a\u03c5\u03ba\u03bb\u03bf\u03c6\u03cc\u03c1\u03b7\u03c3\u03b5 \u03b7 \u03c0\u03bb\u03ae\u03c1\u03c9\u03c2 patched \u03ad\u03ba\u03b4\u03bf\u03c3\u03b7 <strong>0.9.124<\/strong>.<\/li>\n\n\n<li><strong>February 21, 2026<\/strong> &#8211; (\u03a0\u03c1\u03bf\u03b3\u03c1\u03b1\u03bc\u03bc\u03b1\u03c4\u03b9\u03c3\u03bc\u03ad\u03bd\u03bf) Wordfence Free \u03b8\u03b1 \u03bb\u03ac\u03b2\u03b5\u03b9 \u03c4\u03b7\u03bd \u03af\u03b4\u03b9\u03b1 \u03c0\u03c1\u03bf\u03c3\u03c4\u03b1\u03c3\u03af\u03b1.<\/li>\n\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u0393\u03b9\u03b1\u03c4\u03af \u03b1\u03c5\u03c4\u03cc \u03c4\u03bf incident \u03b5\u03af\u03bd\u03b1\u03b9 \u03ba\u03b1\u03bb\u03cc \u03c0\u03b1\u03c1\u03ac\u03b4\u03b5\u03b9\u03b3\u03bc\u03b1 \u201cdefense in depth\u201d<\/h2>\n\n\n\n<p>\u0395\u03b4\u03ce \u03c6\u03b1\u03af\u03bd\u03b5\u03c4\u03b1\u03b9 \u03ba\u03b1\u03b8\u03b1\u03c1\u03ac \u03c0\u03ce\u03c2 \u03ad\u03bd\u03b1 exploit chain \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03c0\u03c1\u03bf\u03ba\u03cd\u03c8\u03b5\u03b9 \u03b1\u03c0\u03cc \u03c6\u03b1\u03b9\u03bd\u03bf\u03bc\u03b5\u03bd\u03b9\u03ba\u03ac \u00ab\u03b4\u03b5\u03c5\u03c4\u03b5\u03c1\u03b5\u03cd\u03bf\u03bd\u00bb \u03bb\u03ac\u03b8\u03bf\u03c2: \u03b1\u03c0\u03bf\u03c4\u03c5\u03c7\u03af\u03b1 \u03c3\u03b5 <code>openssl_private_decrypt()<\/code>\/RSA decrypt \u03c0\u03bf\u03c5 \u03b4\u03b5\u03bd \u03c4\u03b5\u03c1\u03bc\u03b1\u03c4\u03af\u03b6\u03b5\u03b9 \u03c3\u03c9\u03c3\u03c4\u03ac, \u03bc\u03b5\u03c4\u03b1\u03c6\u03bf\u03c1\u03ac \u03bb\u03ac\u03b8\u03bf\u03c5\u03c2 \u03c4\u03cd\u03c0\u03bf\u03c5 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03bf\u03c5 (<code>false<\/code>) \u03c3\u03b5 crypto initialization \u03ba\u03b1\u03b9 \u03c3\u03c4\u03b7 \u03c3\u03c5\u03bd\u03ad\u03c7\u03b5\u03b9\u03b1 file write \u03c7\u03c9\u03c1\u03af\u03c2 \u03b9\u03c3\u03c7\u03c5\u03c1\u03bf\u03cd\u03c2 \u03c0\u03b5\u03c1\u03b9\u03bf\u03c1\u03b9\u03c3\u03bc\u03bf\u03cd\u03c2 (sanitization\/allowlist). \u03a3\u03b5 plugins \u03c0\u03bf\u03c5 \u03b4\u03b9\u03b1\u03c7\u03b5\u03b9\u03c1\u03af\u03b6\u03bf\u03bd\u03c4\u03b1\u03b9 \u03bc\u03b5\u03c4\u03b1\u03c6\u03bf\u03c1\u03ac backup, \u03ba\u03ac\u03b8\u03b5 \u03c3\u03c4\u03ac\u03b4\u03b9\u03bf \u03c0\u03c1\u03ad\u03c0\u03b5\u03b9 \u03bd\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 \u03b1\u03c5\u03c3\u03c4\u03b7\u03c1\u03cc: fail-closed \u03c3\u03c4\u03b7 \u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03ac\u03c6\u03b7\u03c3\u03b7 \u03ba\u03b1\u03b9 \u03b1\u03c5\u03c3\u03c4\u03b7\u03c1\u03ac allowlists (paths, extensions, MIME, storage isolation).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u03a3\u03cd\u03bd\u03bf\u03c8\u03b7<\/h2>\n\n\n\n<p>\u03a4\u03bf WPvivid Backup \u03b5\u03c0\u03b7\u03c1\u03b5\u03ac\u03c3\u03c4\u03b7\u03ba\u03b5 \u03b1\u03c0\u03cc \u03bc\u03b9\u03b1 <strong>Critical<\/strong> \u03b5\u03c5\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1 (CVE-2026-1357) \u03c0\u03bf\u03c5 \u03b5\u03c0\u03b9\u03c4\u03c1\u03ad\u03c0\u03b5\u03b9 <strong>unauthenticated arbitrary file upload<\/strong> \u03ba\u03b1\u03b9 \u03b4\u03c5\u03bd\u03b7\u03c4\u03b9\u03ba\u03ac <strong>RCE<\/strong>, \u03bc\u03b5 \u03bc\u03b5\u03b3\u03b1\u03bb\u03cd\u03c4\u03b5\u03c1\u03bf \u03c1\u03af\u03c3\u03ba\u03bf \u03b3\u03b9\u03b1 installations \u03c0\u03bf\u03c5 \u03ad\u03c7\u03bf\u03c5\u03bd \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03ae\u03c3\u03b5\u03b9 \u03c4\u03b7 \u03bb\u03ae\u03c8\u03b7 backup \u03bc\u03ad\u03c3\u03c9 generated key. \u0397 \u03b5\u03c5\u03c0\u03ac\u03b8\u03b5\u03b9\u03b1 \u03b4\u03b9\u03bf\u03c1\u03b8\u03ce\u03b8\u03b7\u03ba\u03b5 \u03c0\u03bb\u03ae\u03c1\u03c9\u03c2 \u03c3\u03c4\u03b7\u03bd <strong>0.9.124<\/strong> \u03bc\u03b5 \u03ad\u03bb\u03b5\u03b3\u03c7\u03bf \u03b3\u03b9\u03b1 \u03b1\u03c0\u03bf\u03c4\u03c5\u03c7\u03af\u03b1\/\u03ba\u03b5\u03bd\u03cc RSA key \u03c3\u03c4\u03bf decrypt \u03ba\u03b1\u03b9 \u03bc\u03b5 allowlist \u03b5\u03bb\u03ad\u03b3\u03c7\u03bf\u03c5 extensions \u03b3\u03b9\u03b1 \u03c4\u03b1 uploads.<\/p>\n\n\n<div class=\"references-section\">\n                <h2>\u0391\u03bd\u03b1\u03c6\u03bf\u03c1\u03ad\u03c2 \/ \u03a0\u03b7\u03b3\u03ad\u03c2<\/h2>\n                <ul class=\"references-list\"><li><a href=\"https:\/\/www.wordfence.com\/blog\/2026\/02\/800000-wordpress-sites-affected-by-arbitrary-file-upload-vulnerability-in-wpvivid-backup-wordpress-plugin\/\" target=\"_blank\" rel=\"noopener noreferrer\">800,000 WordPress Sites Affected by Arbitrary File Upload Vulnerability in WPvivid Backup WordPress Plugin<\/a><\/li><li><a href=\"https:\/\/www.wordfence.com\/threat-intel\/vulnerabilities\/wordpress-plugins\/wpvivid-backuprestore\/migration-backup-staging-09123-unauthenticated-arbitrary-file-upload\" target=\"_blank\" rel=\"noopener noreferrer\">Migration, Backup, Staging &lt;= 0.9.123 &#8212; Unauthenticated Arbitrary File Upload<\/a><\/li><li><a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-1357\" target=\"_blank\" rel=\"noopener noreferrer\">CVE-2026-1357<\/a><\/li><li><a href=\"https:\/\/wordpress.org\/plugins\/wpvivid-backuprestore\/\" target=\"_blank\" rel=\"noopener noreferrer\">WPvivid Backup &amp; Migration<\/a><\/li><li><a href=\"https:\/\/www.wordfence.com\/threat-intel\/bug-bounty-program\/\" target=\"_blank\" rel=\"noopener noreferrer\">Bug Bounty Program<\/a><\/li><\/ul>\n            <\/div>","protected":false},"excerpt":{"rendered":"<p>\u0388\u03bd\u03b1 Critical (CVSS 9.8) Arbitrary File Upload \u03c3\u03c4\u03bf WPvivid Backup \u03bc\u03c0\u03bf\u03c1\u03b5\u03af \u03bd\u03b1 \u03bf\u03b4\u03b7\u03b3\u03ae\u03c3\u03b5\u03b9 \u03c3\u03b5 Remote Code Execution \u03c7\u03c9\u03c1\u03af\u03c2 login-\u03b1\u03bb\u03bb\u03ac \u03ba\u03c5\u03c1\u03af\u03c9\u03c2 \u03c3\u03b5 sites \u03c0\u03bf\u03c5 \u03ad\u03c7\u03bf\u03c5\u03bd \u03b4\u03b7\u03bc\u03b9\u03bf\u03c5\u03c1\u03b3\u03ae\u03c3\u03b5\u03b9 key \u03b3\u03b9\u03b1 \u03bd\u03b1 \u03bb\u03b1\u03bc\u03b2\u03ac\u03bd\u03bf\u03c5\u03bd backups \u03b1\u03c0\u03cc \u03ac\u03bb\u03bb\u03bf site.<\/p>\n","protected":false},"author":67,"featured_media":212,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[81,36,11,15,10],"class_list":["post-213","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-57","tag-cve","tag-plugins","tag-security","tag-wordfence","tag-wordpress"],"_links":{"self":[{"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/posts\/213","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/users\/67"}],"replies":[{"embeddable":true,"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/comments?post=213"}],"version-history":[{"count":0,"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/posts\/213\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/media\/212"}],"wp:attachment":[{"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/media?parent=213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/categories?post=213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/helloblog.io\/el\/wp-json\/wp\/v2\/tags?post=213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}