Security Advisory

CVE-2026-53599

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-31 19:43:15

Last updated 2026-07-31 21:39:28

Assigner GitHub_M

CVSS score not scored

State PUBLISHED

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.

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