CVE-2021-26036: Joomla!

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

An issue was discovered in Joomla! 2.5.0 through 3.9.27. Missing validation of input could lead to a broken usergroups table.

Affected products

• Joomla! Joomla!: from 2.5.0, up to and including 3.9.27

Published 2021-07-07. Last modified 2026-06-17.