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.
Metrics
Affected Vendors & Products
References
History
Wed, 07 Oct 2026 21:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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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 |
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| 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
|
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
Updated: 2026-10-07T20:50:46.503Z
Status : Deferred
Published: 2026-10-05T16:17:06.270
Modified: 2026-10-07T21:17:09.367
Link: CVE-2026-104890
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