CVE-2026-53599

highCVSS 7.5covered by 1 sourcefirst seen 2026-07-31

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.

⚡ Watch CVE-2026-53599

Get an email if CVE-2026-53599 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.

Exploitation outlook

Low exploitation risk0.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-53599: REDAXO is a PHP-based content management system. From 5.18.2 until 5.21.1, rex_mediapool::isAl…nvd · 2026-07-31

External references

NVD record for CVE-2026-53599

CVE.org record

Embed the live status

— this badge updates automatically when the KEV or exploit status changes. How to embed it →

[![CVE-2026-53599 status](https://www.csirts.com/badge/CVE-2026-53599)](https://www.csirts.com/cve/CVE-2026-53599)