{"schemaVersion":3,"id":"CVE-2026-111862","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Rank Math SEO PRO for WordPress is affected by a supply-chain compromise in a subset of version 3.0.123 packages downloaded or updated between October 15, 2026 at 20:02 UTC and October 16, 2026 at 07:12 UTC. Rank Math states that the affected plugin files contained malware that could compromise a website if the plugin was activated and directs sites that activated an affected package to treat the website as compromised. The malware may establish persistent access, communicate with rank1cdn[.]com, recreate hidden backdoors on page visits, and expose WordPress credentials, database credentials, API keys, and other secrets accessible to the web server. Rank Math identifies three malicious wp_options keys, hidden PHP backdoors, unauthorized administrator accounts, a fake WordPress core file, PHP-executable .cache files, and a system cron marker as incident indicators. Only packages obtained during the vendor-confirmed window are claimed as affected; version 3.0.123 alone is not sufficient to establish compromise. Rank Math removed the affected files and released version 3.0.124 as the clean replacement.","dates":{"published":"2026-10-19T16:35:59.949Z","modified":"2026-10-20T14:10:31.918Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00715,"percentile":0.52935,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-20T00:00:00.000Z","score":0.00715,"percentile":0.52935}],"last30":[{"date":"2026-10-20T00:00:00.000Z","score":0.00715,"percentile":0.52935}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-506","name":"Embedded Malicious Code","description":"The product contains code that appears to be malicious in nature.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/506.html"}],"affected":[{"vendor":"rankmath","product":"rank math seo pro","name":"Rank Math SEO PRO","label":"rank math seo pro","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"3.0.123","noFixRecorded":false,"fixedIn":null}],"versionsText":"3.0.123","eol":null,"hubHref":"/vendor/rankmath/rank_math_seo_pro"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/81cd7a2c-ad0c-4dbc-b5dc-07ec866d5c1f?source=cve","label":"www.wordfence.com/threat-intel/vulnerabilities/id/81cd7a2c-ad0c-4dbc-b5dc-07ec866d5c1f?source=cve","hostname":"www.wordfence.com","tags":[]},{"url":"https://rankmath.com/kb/pro-3-0-123-security-incident/","label":"rankmath.com/kb/pro-3-0-123-security-incident/","hostname":"rankmath.com","tags":[]},{"url":"https://rankmath.com/changelog/","label":"rankmath.com/changelog/","hostname":"rankmath.com","tags":[]},{"url":"https://urlscan.io/result/01a145c2-8dc8-72ff-a65d-21209ca29c4f/","label":"urlscan.io/result/01a145c2-8dc8-72ff-a65d-21209ca29c4f/","hostname":"urlscan.io","tags":[]},{"url":"https://rdap.verisign.com/com/v1/domain/rank1cdn.com","label":"rdap.verisign.com/com/v1/domain/rank1cdn.com","hostname":"rdap.verisign.com","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-19T16:35:59.949Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-20T14:10:31.918Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T18:27:20.774Z","stale":false,"partial":false}}