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CVE-2026-63001— REDAXO: Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()`

Quick assessment

Affected
redaxo core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 4.8 · Medium
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I. Basic Information for CVE-2026-63001

Vulnerability Information

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Vulnerability Title
REDAXO: Stored XSS via Unescaped Media Manager Type Name in `mediaIsInUse()`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
redaxo core < 5.21.2 -

II. Public POCs for CVE-2026-63001

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III. Intelligence Information for CVE-2026-63001

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Patches & Fixes for CVE-2026-63001 (2)

Vendor Pages for CVE-2026-63001 (1)

Other References for CVE-2026-63001 (1)

Same Patch Batch · redaxo · 2026-09-23 · 4 CVEs total

CVE-2026-63000 6.4 MEDIUM REDAXO: Missing CSRF Protection on Package Update Action Allows Forced Addon Updates
CVE-2026-63002 4.8 MEDIUM REDAXO: Stored XSS in Mediapool Sync Page via Unescaped Filesystem Filenames
CVE-2026-62998 4.3 MEDIUM REDAXO: Unwhitelisted ORDER BY Column in rex_list Allows Authenticated Column Enumeration

IV. Related Vulnerabilities

Same product: core
Same vendor: redaxo
Same weakness: CWE-79

V. Comments for CVE-2026-63001

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