CVE-2026-104890
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Kunstmaan | KunstmaanBundlesCMS | < 7.3.1 | affected |
| kunstmaan | bundles-cms | < 7.3.1 | affected |
| kunstmaan | media-bundle | < 7.3.1 | affected |
Weaknesses
- CWE-434: CWE-434: Unrestricted Upload of File with Dangerous Type
References
- https://github.com/Kunstmaan/KunstmaanBundlesCMS/security/advisories/GHSA-p279-5wcv-45vq
- https://github.com/Kunstmaan/KunstmaanBundlesCMS/commit/1bbdfdeac8e7e91506b1a9271360b9b68d7690d3
- https://github.com/Kunstmaan/KunstmaanBundlesCMS/releases/tag/7.3.2
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