Vulnerability Description
OpenCATS prior to commit 3002a29 contains a PHP code injection vulnerability in the installer AJAX endpoint that allows unauthenticated attackers to execute arbitrary code by injecting PHP statements into the databaseConnectivity action parameter. Attackers can break out of the define() string context in config.php using a single quote and statement separator to inject malicious PHP code that persists and executes on every subsequent page load when the installation wizard remains incomplete.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://chocapikk.com/posts/2026/opencats-installer-rce/
- https://github.com/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172
- https://github.com/opencats/OpenCATS/blob/46e4727/modules/install/ajax/ui.php#L1
- https://github.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e1899066
- https://github.com/opencats/OpenCATS/pull/706
- https://www.vulncheck.com/advisories/opencats-php-code-injection-via-installer-a
FAQ
What is CVE-2026-27760?
CVE-2026-27760 is a vulnerability with a CVSS score of 8.1 (HIGH). OpenCATS prior to commit 3002a29 contains a PHP code injection vulnerability in the installer AJAX endpoint that allows unauthenticated attackers to execute arbitrary code by injecting PHP statements ...
How severe is CVE-2026-27760?
CVE-2026-27760 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27760?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.