CVE-2026-21631: Joomla! Core - [20260303] - XSS vector in com_associations comparison view
Published Apr 1, 2026
·Updated
Lack of output escaping leads to a XSS vector in the multilingual associations component.
Affected Software
3 affected components
Joomla Joomla Core
Joomla Joomla\!>=3.0.0<5.4.4
Joomla Joomla\!>=6.0.0<6.0.4
Event History
Apr 1, 2026
CVE Published
via MITRE·09:03 AM
Data Sourced
via MITRE·09:03 AM
DescriptionWeakness
Data Sourced
via NVD·10:16 AM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-21631?
The severity of CVE-2026-21631 is classified as high due to its potential for exploitation via XSS attacks.
2
How do I fix CVE-2026-21631?
To fix CVE-2026-21631, update Joomla to the latest version that includes the patch addressing the XSS vulnerability in com_associations.
3
What components are affected by CVE-2026-21631?
CVE-2026-21631 specifically affects the Joomla Core, particularly the multilingual associations component.
4
What type of vulnerability is CVE-2026-21631?
CVE-2026-21631 is a cross-site scripting (XSS) vulnerability due to inadequate output escaping.
5
Is user data at risk due to CVE-2026-21631?
Yes, CVE-2026-21631 poses a risk to user data as it allows attackers to execute scripts in the context of a user's session.