[20260902] - Core - Unauthorized user account creation via profile.save controller

Project: Joomla!
SubProject: CMS
Impact: Moderate
Severity: Moderate
Probability: Moderate
Versions: 1.5.0-5.4.8,6.0.0-6.1.3
Exploit type: Authorization Bypass Through User-Controlled Key
Reported Date: 2026-08-09
Fixed Date: 2026-09-25
CVE Number: CVE-2026-90907

Description

The profile.save controller did not check the login state of a user, allowing the creation of guest-level users on sites without active user registration.

Affected Installs

Joomla! CMS versions 1.5.0-5.4.8, 6.0.0-6.1.3

Solution

Upgrade to version 5.4.9, 6.1.4

Contact

The JSST at the Joomla! Security Centre.

Reported By: Adithyan P