CVE-2026-63001

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

Published Sep 23, 2026 CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-mf2p-wjp4-99pq REDAXO: Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()`
History
Type Values Removed Values Added
First Time appeared Redaxo redaxo
CPEs cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:*
Vendors & Products Redaxo redaxo
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Redaxo
Redaxo core
Vendors & Products Redaxo
Redaxo core
Type Values Removed Values Added
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.
Title REDAXO: Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()`
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Sep 23, 2026, 7:45 PM
Reserved
Jul 14, 2026, 11:10 PM
Status
Analyzed
Published
Sep 23, 2026, 3:17 PM
Modified
Oct 19, 2026, 8:35 PM