PT-2026-35727 · Opencats · Opencats

Valentin Lobstein + 1 · Published 2026-04-28 · Updated 2026-04-28 · CVE-2026-27760

Mitre

CVSS v3.1

8.1

High

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Exploit

Fix

RCE

Code Injection

Weakness Enumeration

CWE-94

Related Identifiers

CVE-2026-27760

Affected Products

Opencats

References · 10

• 🔥 https://chocapikk.com/posts/2026/opencats-installer-rce · Exploit
• https://github.com/opencats/OpenCATS/commit/3002a29f4c3cada1aa2c4f3d4ae4e189906606b6 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-27760 · Security Note
• https://github.com/opencats/OpenCATS/blob/46e4727/modules/install/ajax/ui.php#L130 · Note
• https://github.com/opencats/OpenCATS/pull/706 · Note
• https://github.com/opencats/OpenCATS/blob/46e4727/lib/CATSUtility.php#L142-L172 · Note
• https://twitter.com/VulmonFeeds/status/2049231819862630670 · Twitter Post
• https://twitter.com/KaitanSecurity/status/2049164253957939330 · Twitter Post
• https://vulncheck.com/advisories/opencats-php-code-injection-via-installer-ajax-endpoint · Note
• https://twitter.com/Chocapikk_/status/2049124793107030102 · Twitter Post