CVE-2026-90918

Joomla! Core - [20260908] - Core - XSS in HTML Mail Templates in Joomla 4.0.0-5.4.8, 6.0.0-6.1.3 - The mail template feature lacks an escaping mechanism, causing XSS vectors in multiple extensions.

Score

CVSS 4.0 6.9 Medium

Status

Analyzed - security@joomla.org

Published

2026-09-29

Last modified

2026-10-06

Weaknesses

CWE-79

Affected products

• Joomla! (Joomla)
• Joomla Cms (Joomla Project)

References

• https://www.joomla.org/
• https://developer.joomla.org/security-centre/1088-20260908-core-xss-in-html-mail-templates.html