Home/CVE/Vulnerability in Wikimedia Foundation CheckUser. This vulnerability is associated with program files includes/Mail/UserM
CVE

CVE-2025-67478

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

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.

HIGH · CVSS 8.8 EPSS 0.00013
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
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Affected Products & Versions

3
mediawiki checkuser>= 1.39.0 and < 1.39.14
mediawiki checkuser>= 1.43.0 and < 1.43.4
mediawiki checkuserall versions
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 Feb 2026 · 02:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://phabricator.wikimedia.org/T385403Broken Link
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