High severity7.5NVD Advisory· Published Jul 31, 2026· Updated Sep 9, 2026
CVE-2026-53599
CVE-2026-53599
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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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
redaxo/sourcePackagist | >= 5.18.2, < 5.21.1 | 5.21.1 |
Affected products
2Patches
Vulnerability mechanics
References
5News mentions
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