[20260907] - Core - Improper ACL checks in outputs for tagged items

Project: Joomla!
SubProject: CMS
Impact: Low
Severity: Moderate
Probability: Moderate
Versions: 4.0.0-5.4.8,6.0.0-6.1.3
Exploit type: Incorrect Access Control
Reported Date: 2026-07-28
Fixed Date: 2026-09-25
CVE Number: CVE-2026-90917

Description

An improper access check allows unauthorized users to view content items from inaccessible categories.

Affected Installs

Joomla! CMS versions 4.0.0-5.4.8, 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: Amin İsayev