CVE-2026-27760

CRITICAL EPSS 97.4%
Published Apr 28, 20262mo ago · Modified Jun 17, 20262w ago
9.2 CVSS 4.0
Critical
Find Similar
Published Apr 28, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
9.2
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
97.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-94 Improper Control of Generation of Code (Code Injection) Injection

References 6

  • chocapikk.com https://chocapikk.com/posts/2026/opencats-installer-rce/
  • github.com https://github.com/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172
  • github.com https://github.com/opencats/OpenCATS/blob/46e4727/modules/install/ajax/ui.php#L130
  • github.com https://github.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6
  • github.com https://github.com/opencats/OpenCATS/pull/706
  • vulncheck.com https://www.vulncheck.com/advisories/opencats-php-code-injection-via-installer-ajax-endpoint

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.