CVE-2025-61651CWE-79

i18n XSS through Special:CheckUser CheckUser helper

published February 3, 2026

CVSS v4.0
0.0
EPSS
0%
Percentile
11.6
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
0.0 · NONE
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U
EPSS
0.00218 · 11.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-02-03T00:53Z
EPSS history
Timeline
  • 03 FEB 00:53Z
    i18n XSS through Special:CheckUser CheckUser helper
    cvelistv5