REDAXO: Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()`

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

• redaxo/source 5.21.2Fixed version · GitHub Advisories · composer package redaxo/source: upgrade to 5.21.2 or later (affected <= 5.21.1)
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Packages ]Affected open-source packages

• redaxo/source composerAffected <= 5.21.1 · fixed in 5.21.2 · GHSA-mf2p-wjp4-99pq

[ References ]References

• github.com/redaxo/core/commit/2daaa3a30570bc76a82f63fd21fb8c9c2cd5dc7cPatch
• github.com/redaxo/core/pull/6581Issue TrackingPatch
• github.com/redaxo/core/releases/tag/5.21.2Release Notes
• github.com/redaxo/core/security/advisories/GHSA-mf2p-wjp4-99pqExploitVendor Advisory