[20260306] - Core - Improper access check in webservice endpoints

Project: Joomla!
SubProject: CMS
Impact: High
Severity: High
Probability: Low
Versions: 4.0.0-5.4.3, 6.0.0-6.0.3
Exploit type: Incorrect Access Control
Reported Date: 2026-03-09
Fixed Date: 2026-03-31
CVE Number: CVE-2026-23899

Description

An improper access check allows unauthorized access to webservice endpoints.

Affected Installs

Joomla! CMS versions 4.0.0-5.4.3, 6.0.0-6.0.3

Solution

Upgrade to version 5.4.4 or 6.0.4

Contact

The JSST at the Joomla! Security Centre.

Reported By: Phil Taylor