Froxlor up to 2.3.5 Setting lib/userdata.inc.php parseArrayToString privileged_user code injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Froxlor up to 2.3.5. This issue affects the function PhpHelper::parseArrayToString in the library lib/userdata.inc.php of the component Setting Handler. Such manipulation of the argument privileged_user leads to code injection. This vulnerability is documented as CVE-2026-41229. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Froxlor up to 2.3.5. Affected by this issue is the function PhpHelper::parseArrayToString in the library lib/userdata.inc.php of the component Setting Handler. The manipulation of the argument privileged_user 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:

Froxlor is open source server administration software. Prior to version 2.3.6, `PhpHelper::parseArrayToString()` writes string values into single-quoted PHP string literals without escaping single quotes. When an admin with `change_serversettings` permission adds or updates a MySQL server via the API, the `privileged_user` parameter (which has no input validation) is written unescaped into `lib/userdata.inc.php`. Since this file is `require`d on every request via `Database::getDB()`, an attacker can inject arbitrary PHP code that executes as the web server user on every subsequent page load. Version 2.3.6 contains a patch.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-41229 since 04/18/2026. The exploitation is known to be easy. The attack may be launched remotely. The exploitation needs additional levels of successful authentication. 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:lib/userdata.inc.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.3.6 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 3589ddf93ab59eb2a8971f0f56cbf6266d03c4ae is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-25178) and CERT Bund (WID-SEC-2026-1124). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Open Source Froxlor

Productinfo

Name

• Froxlor

Version

• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.3.4
• 2.3.5

License

• open-source

Website

• Product: https://github.com/froxlor/froxlor/

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

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