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Vulnerability record · CVE-2026-27760 · published 28 April 2026

CVE-2026-27760: Code injection vulnerability

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.

9.2 CVSS 4.0 Critical EPSS 3.4% · top 11.5% CWE-94 · Code injection Deferred
9.2CVSS 4.0 base score
3.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
14 Jul 2026Last modified by NVD

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:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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#L130
https://github.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6
https://github.com/opencats/OpenCATS/pull/706
https://www.vulncheck.com/advisories/opencats-php-code-injection-via-installer-ajax-endpoint

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Source: NIST National Vulnerability Database (record CVE-2026-27760), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.