CVE-2025-61651
Unknown Unknown - Not Provided
Cross-Site Scripting in Wikimedia CheckUser Module Before

Publication date: 2026-02-03

Last updated on: 2026-04-09

Assigner: wikimedia-foundation

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.
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Meta Information
Published
2026-02-03
Last Modified
2026-04-09
Generated
2026-06-16
AI Q&A
2026-02-03
EPSS Evaluated
2026-06-15
NVD
CVE-2025-61651
EUVD
EUVD-2025-206637
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
mediawiki checkuser to 1.44.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability is a Cross-site Scripting (XSS) issue in the Wikimedia Foundation's CheckUser extension. It occurs due to improper neutralization of input during web page generation in the file buildUserElement.Js, which can allow attackers to inject malicious scripts.

Impact Analysis

The vulnerability could allow attackers to execute malicious scripts in the context of the affected web application, potentially leading to unauthorized actions, data theft, or session hijacking for users interacting with the CheckUser extension.

Compliance Impact

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Detection Guidance

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