VULNERABILITY INTELLIGENCE
CVE-2026-53599
CVSS score7.5 HIGH
EPSS probability0.51%
CISA KEVNot currently listed
Published2026-07-31
Last modified2026-10-23
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Description
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/PHP polyglot named shell.php.any.jpg, which web servers with multi-extension PHP handlers can execute as the web-server user. This issue is fixed in version 5.21.1.
Weakness classification
- security-advisories@github.com: CWE-434