What’s Vulnerable › Vulnerabilities

CVE-2026-63002: REDAXO: Stored XSS in Mediapool Sync Page via Unescaped Filesystem Filenames

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-23 · updated 2026-10-19
• Weakness: CWE-79

Description

REDAXO is a PHP-based content management system. Prior to 5.21.2, redaxo/src/addons/mediapool/pages/sync.php inserts filenames held in $diffFiles from the media filesystem into the Mediapool Sync page without rex_escape(). An attacker who can place an unregistered file with HTML metacharacters in the media directory can execute script in the browser of a backend user with media[sync] permission when that user opens the Sync page, enabling session theft or unauthorized backend actions. This issue is fixed in version 5.21.2.

Affected products

• redaxo: before 5.21.2 — fixed in 5.21.2

How to fix

Upgrade to a fixed version: redaxo 5.21.2. Check the vendor advisory for mitigations.

References

• https://github.com/redaxo/core/commit/2daaa3a30570bc76a82f63fd21fb8c9c2cd5dc7c
• https://github.com/redaxo/core/pull/6581
• https://github.com/redaxo/core/releases/tag/5.21.2
• https://github.com/redaxo/core/security/advisories/GHSA-w998-qmw9-mf4m
• https://github.com/redaxo/core/security/advisories/GHSA-w998-qmw9-mf4m

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