[20260707] – Core – XSS in the generic image output layout

• 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: XSS
• Reported Date: 2026-05-15
• Fixed Date: 2026-07-07
• CVE Number: CVE-2026-48953

Description

Lack of escaping leads to an XSS vulnerability in the generic image output layout.

Affected Installs

Joomla! CMS versions 4.0.0-5.4.5,6.0.0-6.1.1

Solution

Upgrade to version 5.4.7, 6.1.2

Contact

The JSST at the Joomla! Security Centre.

Reported By:  Pavel Kohout, Aisle Research