Description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files modules/ext.CheckUser/checkuser/checkUserHelper/buildUserElement.Js. This issue affects CheckUser: from * before 1.44.1.
References (1)
Core 1
Core References
Issue Tracking
https://phabricator.wikimedia.org/T403408
Scores
CVSS v3
6.1
EPSS
0.0001
EPSS Percentile
1.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (2)
mediawiki/checkuser
< 1.44.1
Wikimedia Foundation/CheckUser
< 1.44.1
Published
Feb 03, 2026
Tracked Since
Feb 18, 2026