CVE Catalog

CVE-2026-111862

CriticalCVSS 9.8
Published: Translated: NVD NIST

Summary

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 20:02 UTC and October 16, 2026 07:12 UTC. The affected plugin files contained malware that could compromise a website if activated, establish persistent access, communicate with rank1cdn[.]com, and expose WordPress credentials, database credentials, API keys, and other secrets.

Risk Assessment

Sites that activated an affected package should be treated as compromised — attackers may have persistent access, hidden backdoors, and stolen credentials. The risk includes full compromise of the web server and related systems.

Recommendation

Identify sites that downloaded or updated version 3.0.123 within the specified window, treat them as compromised, and perform a full investigation (wp_options, admin accounts, PHP files, cron). Update to the clean version 3.0.124 and remove any detected indicators of compromise.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS