Arbitrary file upload in Redaxo Core

CVE-2026-53599

REDAXO is a PHP-based content management system. From 5.18.2 until 5.21.1, rex_mediapool::isAllowedExtension in redaxo/src/addons/mediapool/lib/mediapool.php lets an authenticated backend user with media[upload] permission upload a JPEG/PH…

Vulnerability class: Unrestricted File Upload

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-53599?
CVE-2026-53599 is a high-severity vulnerability in Redaxo Core, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.5/10. Published 2026-07-31.
How severe is CVE-2026-53599?
High severity. CVSS v3 base score is 7.5 out of 10.