[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