CVE-2020-8421: Joomla!

Medium severity, CVSS 6.1. EPSS: 1% chance of exploitation in the next 30 days.

An issue was discovered in Joomla! before 3.9.15. Inadequate escaping of usernames allows XSS attacks in com_actionlogs.

Affected products

• Joomla! Joomla!: from 3.9.0, before 3.9.14 (fixed in 3.9.14)

Published 2020-01-28. Last modified 2026-06-17.