CVE-2026-63001

MediumCVSS 4.8/10Last modified Oct 19, 2026

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.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
redaxo	core	< 5.21.2

References

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

Timeline

Published: Sep 23, 2026
Last modified: Oct 19, 2026
NVD status: Analyzed

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