CVE-2026-63001
Received Received - Intake

Stored XSS in REDAXO Media Manager via Unsanitized Type Name

Publication date: 2026-09-23

Last updated on: 2026-09-23

Assigner: GitHub, Inc.

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.

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Meta Information

Published
2026-09-23
Last Modified
2026-09-23
Generated
2026-09-23
AI Q&A
2026-09-23
EPSS Evaluated
N/A
NVD
CVE-2026-63001
EUVD
EUVD-2026-85329

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
redaxo redaxo to 5.21.1 (inc)
redaxo redaxo to 5.21.2 (exc)
redaxo redaxo 5.21.2

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in REDAXO CMS versions up to 5.21.1. It occurs in the Media Manager addon when deleting media files. The warning message includes a type name without HTML escaping, allowing attackers with Media Manager access to inject malicious scripts. The payload executes when another administrator tries to delete a linked media file, potentially leading to session hijacking or account takeover.

Detection Guidance

Check REDAXO version with: grep -r "version" /path/to/redaxo/src/core/lib/redaxo.php. If version is below 5.21.2, the system is vulnerable. Inspect media_manager addon files for missing rex_escape() calls in media_manager.php, particularly around mediaIsInUse() function handling.

Impact Analysis

An attacker could steal your session or perform unauthorized backend actions by tricking you into clicking a malicious link or visiting a compromised page. This could lead to full account compromise, data theft, or further system exploitation if you have administrative privileges.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security requirements. It may result in data breaches, unauthorized processing of personal data, or failure to maintain confidentiality, potentially leading to regulatory penalties.

Mitigation Strategies

Upgrade REDAXO to version 5.21.2 or later immediately. Review Media Manager type names for suspicious HTML content. Apply rex_escape() to all user-controlled values before rendering in HTML. Monitor admin sessions for unusual activity.

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