What is CVE-2025-67478?

CVE-2025-67478 is a high-severity vulnerability in Mediawiki Checkuser. CVSS score: 8.8/10. Published 2026-02-03.

How severe is CVE-2025-67478?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Mediawiki Checkuser

CVE-2025-67478

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.

EPSS: 0.003 (22.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Mediawiki Checkuser — versions 1.44.0
Wikimedia Foundation Checkuser

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Broken Link)

Frequently asked questions

What is CVE-2025-67478?: CVE-2025-67478 is a high-severity vulnerability in Mediawiki Checkuser. CVSS score: 8.8/10. Published 2026-02-03.
How severe is CVE-2025-67478?: High severity. CVSS v3 base score is 8.8 out of 10.