Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files includes/Mail/UserMailer.Php.

This issue affects CheckUser: from * before 1.39.14, 1.43.4, 1.44.1.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0002.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Wikimedia Foundation CheckUser unaffected
Version Status Constraints
* affected < 1.39.14, 1.43.4, 1.44.1

Configuration 1 [-]

OR cpe:2.3:a:mediawiki:checkuser:*:*:*:*:*:mediawiki:*:*
cpe:2.3:a:mediawiki:checkuser:*:*:*:*:*:mediawiki:*:*
cpe:2.3:a:mediawiki:checkuser:1.44.0:*:*:*:*:mediawiki:*:*

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Wikimedia Subscribe
Checkuser Subscribe

Project Subscriptions

Vendors Products
Mediawiki Subscribe
Checkuser Subscribe
Wikimedia Subscribe
Checkuser Subscribe
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4428-1 mediawiki security update
Debian DSA Debian DSA DSA-6085-1 mediawiki security update
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://phabricator.wikimedia.org/T385403 cve-icon cve-icon
History

Tue, 14 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
First Time appeared Mediawiki
Mediawiki checkuser
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:mediawiki:checkuser:*:*:*:*:*:mediawiki:*:*
cpe:2.3:a:mediawiki:checkuser:1.44.0:*:*:*:*:mediawiki:*:*
Vendors & Products Mediawiki
Mediawiki checkuser
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

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 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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

Type Values Removed Values Added
Description Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files includes/Mail/UserMailer.Php. This issue affects CheckUser: from * before 1.39.14, 1.43.4, 1.44.1.
Title Wrong E-Mail address composition for usernames with a comma and Umlauts in it like "Döe, Jähn"
References
Metrics cvssV4_0

{'score': 0, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: wikimedia-foundation

Published:

Updated: 2026-03-02T17:43:34.432Z

Reserved: 2025-12-08T17:51:48.871Z

Link: CVE-2025-67478

cve-icon Vulnrichment

Updated: 2026-02-03T15:29:09.612Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-03T02:16:08.840

Modified: 2026-04-14T14:08:48.420

Link: CVE-2025-67478

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-04T12:14:16Z

Weaknesses