XSS in Redaxo Core
CVE-2026-63002
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 9.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Redaxo Core — versions < 5.21.2
- Redaxo
Weakness classification (CWE)
References
- github.com/redaxo/core/security/advisories/GHSA-w998-qmw9-mf4m (Exploit, Vendor Advisory)
- github.com/redaxo/core/pull/6581 (Patch, Issue Tracking)
- github.com/redaxo/core/commit/2daaa3a30570bc76a82f63fd21fb8c9c2cd5dc7c (Patch)
- github.com/redaxo/core/releases/tag/5.21.2 (Release Notes)
Frequently asked questions
- What is CVE-2026-63002?
- CVE-2026-63002 is a medium-severity vulnerability in Redaxo Core, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-09-23.
- How severe is CVE-2026-63002?
- Medium severity. CVSS v3 base score is 4.8 out of 10.