CVE-2026-63001

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.

• CWE-79

• https://github.com/redaxo/core/commit/2daaa3a30570bc76a82f63fd21fb8c9c2cd5dc7cPatch
• https://github.com/redaxo/core/pull/6581Issue Tracking, Patch
• https://github.com/redaxo/core/releases/tag/5.21.2Release Notes
• https://github.com/redaxo/core/security/advisories/GHSA-mf2p-wjp4-99pqExploit, Vendor Advisory

Published

Sep 23, 2026

Last Modified

Oct 19, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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