by Kastro
Paper/Archive/CVE-2026-27760

CVE-2026-27760

opencats OpenCATS — OpenCATS PHP Code Injection via installer AJAX endpoint

EPSS 33%public exploitCVSS 9.2
critical.is priorityof 100
57
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 98.4.984 × 2019.7Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
OpenCATS≤ 0.9.7.43002a29f4c3cada1aa2c4f3d4ae4e189906606b6CNA

Scores by source

VulnCheck (CNA)9.2CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
VulnCheck (CNA)8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploitchocapikk.com/posts/2026/opencats-installer-rcerefgithub.com/opencats/OpenCATS/pull/706patchgithub.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6refgithub.com/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172refgithub.com/opencats/OpenCATS/blob/46e4727/modules/install/ajax/ui.php#L130writeupvulncheck.com/advisories/opencats-php-code-injection-via-installer-ajax-endpoint