CVE-2026-21631: Joomla!

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Lack of output escaping leads to a XSS vector in the multilingual associations component.

Affected products

• Joomla! Joomla!: from 3.0.0, before 5.4.4 (fixed in 5.4.4); from 6.0.0, before 6.0.4 (fixed in 6.0.4)

Published 2026-04-01. Last modified 2026-06-17.