PT-2026-5739 · Wikimedia Foundation · Checkuser

Published 2026-02-03 · Updated 2026-02-03 · CVE-2025-61651

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Wikimedia Foundation CheckUser versions prior to 1.44.1

Description The software contains a flaw related to improper input neutralization during web page generation, potentially leading to Cross-site Scripting (XSS). This issue is found in the buildUserElement.Js file within the modules/ext.CheckUser/checkuser/checkUserHelper directory.

Recommendations Update to CheckUser version 1.44.1 or later. As a temporary workaround, consider restricting access to the buildUserElement.Js file to minimize the risk of exploitation.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2025-61651

Affected Products

Checkuser

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2025-61651 · Security Note
• https://phabricator.wikimedia.org/T403408 · Note
• https://twitter.com/CVEnew/status/2018497455277690932 · Twitter Post
• https://t.me/CVEtracker/43540 · Telegram Post