[20260806] - Core - XSS through schema.org outputs

Project: Joomla!
SubProject: CMS
Impact: Moderate
Severity: Moderate
Probability: Low
Versions: 5.1.0-5.4.7, 6.0.0-6.1.2
Exploit type: XSS
Reported Date: 2026-07-21
Fixed Date: 2026-08-18
CVE Number: CVE-2026-73336

Description

Improper escaping flags lead to an XSS vector in schema.org markup outputs.

Affected Installs

Joomla! CMS versions 5.1.0-5.4.7, 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: Amin İsayev, Geo (GitHub.com/geo-chen)