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

CVE-2026-21631

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

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

MEDIUM · CVSS 5.4 EPSS 2e-05
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

2
joomla joomla\!>= 3.0.0 and < 5.4.4
joomla joomla\!>= 6.0.0 and < 6.0.4
⚠

Public Exploits & PoCs

1
pocgithub.com · CVE-2026-21631github.com
▣

Scoring & Timeline

5.4
MEDIUM · CVSS v3.1 · security@joomla.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Apr 2026 · 10:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://developer.joomla.org/security-centre/1029-20260303-core-xss-vector-in-com-associations-comparison-view.htmlVendor Advisory
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