CVE-2025-67478: mediawiki checkuser
CVSS: 8.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2025-67478DEBIAN-CVE-2025-67478
Published 03-02-2026Last modified 02-03-2026
Vulnerability summary
CVE-2025-67478 is a high (CVSS 8.8) vulnerability in mediawiki checkuser. EPSS estimates a 0.35% chance of exploitation in the next 30 days, higher than 27.6% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
0.35%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 03-02-2026PublishedVulnerability first disclosed.
- 02-03-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
6 scores · 4 sources · 2 versionsUnknown 0.0Preferred score · CVE.org (CNA)
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:USourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated0.0UnknownCVSS: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
- NVDNIST0.0UnknownCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
High 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.35%
Chance of exploitation in the next 30 days
Percentile
28%
Versus all other CVEs
30-day change
+0.04 pp
From 0.32% on 19-09-2026
19-09-202619-10-2026
EPSS score0.35%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Debian1 product
- mediawiki< 1:1.39.17-1~deb12u1 | < 1:1.43.6+dfsg-1~deb13u1 | < 1:1.43.6+dfsg-1
Mediawiki1 product
- checkuser≥ 1.39.0, < 1.39.14 | ≥ 1.43.0, < 1.43.4 | 1.44.0
Ubuntu1 product
- mediawikiAll versions (No fix recorded)
Wikimedia foundation1 product
- checkuser< 1.39.14, 1.43.4, 1.44.1
4 vendors · 4 products
References
5 links- phabricator.wikimedia.org/T385403Broken Link
