CVE-2026-21631

EUVD-2026-17857
Lack of output escaping leads to a XSS vector in the multilingual associations component.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.4 MEDIUM
NETWORK
LOW
LOW
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Affected Products (NVD)
VendorProductVersion
joomlajoomla\!
3.0.0 ≤
𝑥
< 5.4.4
joomlajoomla\!
6.0.0 ≤
𝑥
< 6.0.4
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://developer.joomla.org/security-centre/1029-20260303-core-xss-vector-in-com-associations-comparison-view.html
https://github.com/Shirshaw64p/security-advisories/tree/main/CVE-2026-21631