[20260304] - Core - XSS vectors in various article title outputs

Project: Joomla!
SubProject: CMS
Impact: Moderate
Severity: Moderate
Probability: Low
Versions: 4.0.0-5.4.3, 6.0.0-6.0.3
Exploit type: XSS
Reported Date: 2026-03-10
Fixed Date: 2026-03-31
CVE Number: CVE-2026-21632

Description

Lack of output escaping for article titles leads to XSS vectors in various locations.

Affected Installs

Joomla! CMS versions 4.0.0-5.4.3, 6.0.0-6.0.3

Solution

Upgrade to version 5.4.4 or 6.0.4

Contact

The JSST at the Joomla! Security Centre.

Reported By: peter vanderhulst