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CVE

CVE-2026-27760

OpenCATS PHP Code Injection via installer AJAX endpoint
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CVE

CVE-2026-27760

OpenCATS PHP Code Injection via installer AJAX endpoint

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.2
-
4.0
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:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

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/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27760.json, https://nvd.nist.gov/vuln/detail/CVE-2026-27760, 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, https://chocapikk.com/posts/2026/opencats-installer-rce/

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.34629%
EPSS Percentile
0.98295%
Introduced Version
0
Fix Available
3002a29f4c3cada1aa2c4f3d4ae4e189906606b6

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