Medium severity · published Sep 23, 2026
CVE-2026-63002
REDAXO: Stored XSS in Mediapool Sync Page via Unescaped Filesystem Filenames
4.8
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
core · redaxo
< 5.21.2 · source: vendor
RE
Redaxo · Redaxo
before 5.21.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63002
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63002
Patch
https://github.com/redaxo/core/commit/2daaa3a30570bc76a82f63fd21fb8c9c2cd5dc7c
Issue Tracking
https://github.com/redaxo/core/pull/6581
Release Notes
https://github.com/redaxo/core/releases/tag/5.21.2
Exploit
https://github.com/redaxo/core/security/advisories/GHSA-w998-qmw9-mf4m
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