CVE-2021-26038: Joomla!

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

An issue was discovered in Joomla! 2.5.0 through 3.9.27. Install action in com_installer lack the required hardcoded ACL checks for superusers. A default system is not affected cause the default ACL for com_installer is limited to super users already.

Affected products

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

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