[20260101] – Core – Inadequate content filtering for data URLs

• Project: Joomla!
• SubProject: CMS
• Impact: Moderate
• Severity: Moderate
• Probability: Low
• Versions: 4.0.0-5.4.1, 6.0.0-6.0.1
• Exploit type: XSS
• Reported Date: 2025-11-14
• Fixed Date: 2026-01-06
• CVE Number: CVE-2025-63082

Description

Lack of input filtering leads to an XSS vector in the HTML filter code related to data URLs in img tags.

Affected Installs

Joomla! CMS versions 4.0.0-5.4.1, 6.0.0-6.0.1

Solution

Upgrade to version 5.4.2 or 6.0.2

Contact

The JSST at the Joomla! Security Centre.

Reported By:  Sho Sugiyama of SUZUKI MOTOR CORPORATION