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CVE-2026-53599

CVE-2026-53599 · Redaxo has a Mediapool isAllowedExtension bypass via multi-segment filename that leads to authenticated RCE on Apache mod_php multi-extension handlers

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.5 · High · EPSS 0.5% · Fix available

Published
Updated

Stack: php

Affected products and versions

  • core

    Versions
    • >= 5.18.2, < 5.21.1: Affected

    No fix published

  • redaxo/source Packagist

    Versions
    • 5.18.2
    • 5.18.3
    • 5.19.0
    • 5.20.0
    • 5.20.1
    • 5.20.2
    • 5.21.0
    • 5.21.0-beta1
    Affected ranges
    • ECOSYSTEM: ≥ 5.18.2, < 5.21.1

    Update to 5.21.1

Original sources

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