Vulnerability · Published Feb 3, 2026 · Assigned by wikimedia-foundation
CVE-2025-67478Wrong E-Mail address composition for usernames with a comma and Umlauts in it like "Döe, Jähn"
None 0.0
In plain English
A security flaw in CheckUser from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)0.0None
Exploit odds (30 days)0.3%top 71.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mediawiki | 1:1.39.17-1~deb12u1 | DEBIAN-CVE-2025-67478 |
| Debian:12 | mediawiki | 1:1.39.17-1~deb12u1 | DSA-6085-1 |
| Debian:13 | mediawiki | 1:1.43.6+dfsg-1~deb13u1 | DSA-6085-1 |
| Debian:13 | mediawiki | 1:1.43.6+dfsg-1~deb13u1 | DEBIAN-CVE-2025-67478 |
| Debian:14 | mediawiki | 1:1.43.6+dfsg-1 | DEBIAN-CVE-2025-67478 |
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2025-67478 |
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2025-67478 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2025-67478 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wikimedia Foundation | CheckUser | * – before 1.39.14, 1.43.4, 1.44.1 |