Medium · 5.9 CVE-2026-21631 EUVD-2026-17857GHSA-24p2-2h4q-gmhf

Joomla! Core - [20260303] - XSS vector in com_associations comparison view

Published Apr 1, 2026 · Updated Apr 2, 2026 · Assigned by Joomla

Vendor: Joomla! Project Product: Joomla! CMS Category: Web / CMS

Description

Lack of output escaping leads to a XSS vector in the multilingual associations component.

Affected products

Vendor	Product	Affected	Fixed
Joomla! Project	Joomla! CMS	4.0.0-5.4.3, 6.0.0-6.0.3	—

Advisories 1

WID-SEC-2026-0936 Joomla CMS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 1, 2026

References

https://developer.joomla.org/security-centre/1029-20260303-core-xss-vector-in-com-associations-comparison-view.html vendor-advisory
https://github.com/Shirshaw64p/security-advisories/tree/main/CVE-2026-21631 third-party-advisory