CVE WatchOct 7, 2026

CVE-2026-104890

Kunstmaan CMS is an open source content management system based on the Symfony framework. Prior to 7.3.2, src/Kunstmaan/MediaBundle/Helper/F

CVSS

7.2

High

EPSS

0.4%

p35

KEV

—

Exploit Today

0-100

Published: Oct 5, 2026 · Last modified: Oct 7, 2026 · CWE-434

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-10-062026-10-21

Technical 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.

Official references

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