CVE-2016-8870: Joomla!

High severity, CVSS 8.1. EPSS: 81.1% chance of exploitation in the next 30 days.

The register method in the UsersModelRegistration class in controllers/user.php in the Users component in Joomla! before 3.6.4, when registration has been disabled, allows remote attackers to create user accounts by leveraging failure to check the Allow User Registration configuration setting.

Affected products

• Joomla! Joomla!: up to and including 3.6.3

Published 2016-11-04. Last modified 2026-06-17.