REDAXO is a PHP-based content management system. Prior to 5.21.2, the mediaIsInUse() handler in redaxo/src/addons/media_manager/lib/media_manager.php inserts a Media Manager type name into raw backend warning HTML without escaping it when invoked through MEDIA_IS_IN_USE. An administrator with Media Manager access can store HTML in a type name, and the payload executes in another administrator's browser when that administrator tries to delete media referenced by the type's effects, enabling session theft or unauthorized backend actions. This issue is fixed in version 5.21.2.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/redaxo/core/commit/2daaa3a30570bc76a82f63fd21fb8c9c2cd5dc7c Patch
- https://github.com/redaxo/core/pull/6581 Issue Tracking, Patch
- https://github.com/redaxo/core/security/advisories/GHSA-mf2p-wjp4-99pq Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 4.8 · redaxoNVD modified 2026-10-19 20:35
Affected (CPE criteria) 1
cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:*
References 4
- https://github.com/redaxo/core/commit/2daaa3a30570bc76a82f63fd21fb8c9c2cd5dc7c Patch
- https://github.com/redaxo/core/pull/6581 Issue Tracking, Patch
- https://github.com/redaxo/core/releases/tag/5.21.2 Release Notes
- https://github.com/redaxo/core/security/advisories/GHSA-mf2p-wjp4-99pq Exploit, Vendor Advisory