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
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-53599
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-53599 | coverage & exploitation status | NVD · CVE.org |
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