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CVE-2026-21631

MEDIUM CVSS 4.0: 5.9 EPSS 0.00%
Updated Apr 09, 2026
Joomla
Parameter Value
CVSS 5.9 (MEDIUM)
Affected Versions 3.0.0 — 6.0.4
Fixed In 5.4.4
Type CWE-79 (Cross-Site Scripting (XSS))
Vendor Joomla
Public PoC No

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

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
High
Admin privileges needed
User Interaction
Passive
Minimal interaction

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
Low
Partial disruption

CVSS Vector v4.0

Vulnerable Products 2

Configuration From (including) Up to (excluding)
Joomla Joomla\!
cpe:2.3:a:joomla:joomla\!:*:*:*:*:*:*:*:*
3.0.0 5.4.4
Joomla Joomla\!
cpe:2.3:a:joomla:joomla\!:*:*:*:*:*:*:*:*
6.0.0 6.0.4