[20260712] - Core - Incorrect Access Control in com_fields webservice endpoints

Project: Joomla!
SubProject: CMS
Impact: Moderate
Severity: Moderate
Probability: Low
Versions: 4.0.0-5.4.6, 6.0.0-6.1.1
Exploit type: Incorrect Access Control
Reported Date: 2026-05-05
Fixed Date: 2026-07-07
CVE Number: CVE-2026-48958

Description

An improper access check allows unauthorized users to create custom fields via webservices endpoints.

Affected Installs

Joomla! CMS versions 4.0.0-5.4.6, 6.0.0-6.0.0-6.1.1

Solution

Upgrade to version 5.4.7, 6.1.2

Contact

The JSST at the Joomla! Security Centre.

Reported By: Federico Brasili