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
Published Sep 29, 2026
·Updated
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.
Affected Software
1 affected component
Joomla joomla>=4.0.0<=5.4.8, >=6.0.0<=6.1.3
Event History
Sep 29, 2026
CVE Published
via MITRE·04:38 PM
Data Sourced
via MITRE·04:38 PM
DescriptionWeakness
Data Sourced
via NVD·05:17 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
Which Joomla versions are affected?
Affected versions are Joomla 4.0.0 through 5.4.8 and Joomla 6.0.0 through 6.1.3.
2
What component is involved in this issue?
The issue affects the HTML mail template feature in Joomla Core. The lack of an escaping mechanism creates XSS vectors in multiple extensions.