CVE-2026-27760

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.

References

https://www.vulncheck.com/advisories/opencats-php-code-injection-via-installer-ajax-endpoint

https://github.com/opencats/OpenCATS/pull/706

https://github.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6

https://github.com/opencats/OpenCATS/blob/46e4727/modules/install/ajax/ui.php#L130

https://github.com/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172

https://chocapikk.com/posts/2026/opencats-installer-rce/

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4