Rank Math SEO PRO for WordPress is affected by a supply-chain compromise in a subset of version…

Why it is Amber

• CVSS 9.8 critical
• Remotely exploitable without logging in

References

• https://rankmath.com/changelog/
• https://rankmath.com/kb/pro-3-0-123-security-incident/
• https://rdap.verisign.com/com/v1/domain/rank1cdn.com
• https://urlscan.io/result/01a145c2-8dc8-72ff-a65d-21209ca29c4f/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/81cd7a2c-ad0c-4dbc-b5dc-07ec866d5c1f?source=cve

Original 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.