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.
Published: 2026-02-03
Score: 0 Low
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

No advisories yet.

References
Link Providers
https://phabricator.wikimedia.org/T403408 cve-icon cve-icon
History

Thu, 09 Apr 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Mediawiki
Mediawiki checkuser
CPEs cpe:2.3:a:mediawiki:checkuser:*:*:*:*:*:mediawiki:*:*
Vendors & Products Mediawiki
Mediawiki checkuser
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

Wed, 04 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Wikimedia
Wikimedia checkuser
Vendors & Products Wikimedia
Wikimedia checkuser

Tue, 03 Feb 2026 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 03 Feb 2026 13:15:00 +0000

Type Values Removed Values Added
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.
Title i18n XSS through Special:CheckUser CheckUser helper
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 0, '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'}

Subscriptions

Mediawiki Checkuser
Wikimedia Checkuser
cve-icon MITRE

Status: PUBLISHED

Assigner: wikimedia-foundation

Published:

Updated: 2026-02-03T21:08:33.097Z

Reserved: 2025-09-29T13:18:40.094Z

Link: CVE-2025-61651

cve-icon Vulnrichment

Updated: 2026-02-03T21:08:25.420Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-03T02:16:07.407

Modified: 2026-04-09T20:33:09.617

Link: CVE-2025-61651

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-04T12:14:21Z

Weaknesses