CVE-2021-26035: Joomla!

Medium severity, CVSS 6.1. EPSS: 0.7% chance of exploitation in the next 30 days.

An issue was discovered in Joomla! 3.0.0 through 3.9.27. Inadequate escaping in the rules field of the JForm API leads to a XSS vulnerability.

Affected products

• Joomla! Joomla!: from 3.0.0, up to and including 3.9.27

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