[20260804] - Core - Improper ACL checks for custom fields webservice endpoints

Project: Joomla!
SubProject: CMS
Impact: Moderate
Severity: Moderate
Probability: Low
Versions: 4.0.0-5.4.7, 6.0.0-6.1.2
Exploit type: Incorrect Access Control
Reported Date: 2026-07-06
Fixed Date: 2026-08-18
CVE Number: CVE-2026-72531

Description

An improper access check allows unauthorized users to create fields for inaccessible components.

Affected Installs

Joomla! CMS versions 4.0.0-5.4.7, 6.0.0-6.1.2

Solution

Upgrade to version 5.4.8, 6.1.3

Contact

The JSST at the Joomla! Security Centre.

Reported By: ebadfd