CVE-2026-21631 — Cross-site Scripting in Joomla !

CWE-79 — Cross-site Scripting4 documents4 sources
Severity
5.9MEDIUMNVD
EPSS
0.0%
top 99.97%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Joomla !Joomla! Project Joomla! CMS
Timeline
PublishedApr 1

Description

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

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

Affected Packages2 packages

▶NVDjoomla/joomla_!3.0.0 — 5.4.4+1
▶CVEListV5joomla!_project/joomla!_cms4.0.0-5.4.3, 6.0.0-6.0.3+1

🔴Vulnerability Details

2
GHSA
GHSA-24p2-2h4q-gmhf: Lack of output escaping leads to a XSS vector in the multilingual associations component↗2026-04-01
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CVEList
Joomla! Core - [20260303] - XSS vector in com_associations comparison view↗2026-04-01
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🕵️Threat Intelligence

1
Wiz
CVE-2026-21631 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-21631 — Cross-site Scripting in Joomla ! | cvebase