OpenCATS up to 0.9.7.4 AJAX Endpoint config.php define action code injection

Summaryinfo

A vulnerability labeled as critical has been found in OpenCATS up to 0.9.7.4. This vulnerability affects the function define of the file config.php of the component AJAX Endpoint. Such manipulation of the argument action leads to code injection. This vulnerability is listed as CVE-2026-27760. The attack may be performed from remote. There is no available exploit. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability was found in OpenCATS up to 0.9.7.4 and classified as critical. Affected by this issue is the function define of the file config.php of the component AJAX Endpoint. The manipulation of the argument action with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was presented by Valentin Lobstein. The advisory is available at chocapikk.com. This vulnerability is handled as CVE-2026-27760 since 02/23/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

By approaching the search of inurl:config.php it is possible to find vulnerable targets with Google Hacking.

Applying the patch 3002a29f4c3cada1aa2c4f3d4ae4e189906606b6 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-26052). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• OpenCATS

Version

• 0.9.7.0
• 0.9.7.1
• 0.9.7.2
• 0.9.7.3
• 0.9.7.4

License

• open-source

Website

• Product: https://github.com/opencats/OpenCATS/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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