Kunstmaan CMS is an open source content management system based on the Symfony framework. Prior to 7.3.2, src/Kunstmaan/MediaBundle/Helper/File/FileHandler.php performs the blacklisted_extensions check case-sensitively in FileHandler::getFilePath and lowercases the stored extension afterward. An authenticated backend user with media access can upload a mixed-case executable extension such as PHP that bypasses the check and is stored in the web-accessible media directory with an executable lowercase extension. The default blacklist also omits several server-executable extension types, allowing the same code-execution impact where the web server executes uploaded files. This issue is fixed in version 7.3.2.
History

Wed, 07 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 06 Oct 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Kunstmaan
Kunstmaan bundles-cms
Kunstmaan kunstmaanbundlescms
Kunstmaan media-bundle
Vendors & Products Kunstmaan
Kunstmaan bundles-cms
Kunstmaan kunstmaanbundlescms
Kunstmaan media-bundle

Mon, 05 Oct 2026 16:00:00 +0000

Type Values Removed Values Added
Description Kunstmaan CMS is an open source content management system based on the Symfony framework. Prior to 7.3.2, src/Kunstmaan/MediaBundle/Helper/File/FileHandler.php performs the blacklisted_extensions check case-sensitively in FileHandler::getFilePath and lowercases the stored extension afterward. An authenticated backend user with media access can upload a mixed-case executable extension such as PHP that bypasses the check and is stored in the web-accessible media directory with an executable lowercase extension. The default blacklist also omits several server-executable extension types, allowing the same code-execution impact where the web server executes uploaded files. This issue is fixed in version 7.3.2.
Title Kunstmaan CMS: MediaBundle extension blacklist bypass allows authenticated administrators to upload executable PHP files leading to remote code execution
Weaknesses CWE-434
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-05T15:46:21.959Z

Updated: 2026-10-07T20:50:50.492Z

Reserved: 2026-10-02T14:59:11.775Z

Link: CVE-2026-104890

cve-icon Vulnrichment

Updated: 2026-10-07T20:50:46.503Z

cve-icon NVD

Status : Deferred

Published: 2026-10-05T16:17:06.270

Modified: 2026-10-07T21:17:09.367

Link: CVE-2026-104890

cve-icon Redhat

No data.