CVE-2026-63001: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in redaxo core
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.
AI Analysis
Technical Summary
CVE-2026-63001 is a CWE-79 (Improper Neutralization of Input During Web Page Generation) vulnerability in the REDAXO PHP-based content management system. Specifically, the mediaIsInUse() handler in redaxo/src/addons/media_manager/lib/media_manager.php prior to version 5.21.2 inserts a Media Manager type name into backend warning HTML without escaping it. An administrator with Media Manager access can store malicious HTML in a type name, which executes in another administrator's browser when that administrator attempts to delete media referenced by that type. This can enable session theft or unauthorized backend actions. The issue is resolved in REDAXO version 5.21.2.
Potential Impact
This vulnerability allows an administrator with Media Manager access to execute arbitrary HTML/JavaScript in the context of another administrator's browser session. The impact includes potential session theft and unauthorized actions within the backend. The CVSS 3.1 score is 4.8 (medium severity), reflecting limited scope due to required privileges and user interaction.
Mitigation Recommendations
Upgrade REDAXO core to version 5.21.2 or later, where this vulnerability is fixed. No other mitigation is required as the official fix addresses the issue.
CVE-2026-63001: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in redaxo core
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.
CVSS v3.1
Score 4.8medium
Affected software
redaxo
core
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-63001 is a CWE-79 (Improper Neutralization of Input During Web Page Generation) vulnerability in the REDAXO PHP-based content management system. Specifically, the mediaIsInUse() handler in redaxo/src/addons/media_manager/lib/media_manager.php prior to version 5.21.2 inserts a Media Manager type name into backend warning HTML without escaping it. An administrator with Media Manager access can store malicious HTML in a type name, which executes in another administrator's browser when that administrator attempts to delete media referenced by that type. This can enable session theft or unauthorized backend actions. The issue is resolved in REDAXO version 5.21.2.
Potential Impact
This vulnerability allows an administrator with Media Manager access to execute arbitrary HTML/JavaScript in the context of another administrator's browser session. The impact includes potential session theft and unauthorized actions within the backend. The CVSS 3.1 score is 4.8 (medium severity), reflecting limited scope due to required privileges and user interaction.
Mitigation Recommendations
Upgrade REDAXO core to version 5.21.2 or later, where this vulnerability is fixed. No other mitigation is required as the official fix addresses the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-14T23:10:57.032Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab3e330f7a7c54106ea7c6d
Added to database: 09/23/2026, 14:33:20 UTC
Last enriched: 09/23/2026, 14:48:02 UTC
Last updated: 09/24/2026, 03:59:07 UTC
Views: 10
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