Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M

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

Medium 4.8

In plain English

A medium-severity cross-site scripting in core from redaxo. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.8Medium

Exploit odds (30 days)0.2%top 90.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	redaxo/source	5.21.2	GHSA-w998-qmw9-mf4m

Affected products (as reported)

Vendor	Product	Versions
redaxo	core	< 5.21.2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

References

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