CVE-2026-63001: Redaxo Core

Medium severity, CVSS 4.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Redaxo Core: before 5.21.2 (fixed in 5.21.2)

Published 2026-09-23. Last modified 2026-09-23.