Vulnerability · Published May 11, 2026 · Assigned by wikimedia-foundation
CVE-2026-34087Users API leaks whether privileged users have their user groups disabled for lack of 2FA
Medium 5.1
In plain English
A medium-severity information exposure in OATHAuth 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 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)5.1Medium
Exploit odds (30 days)0.3%top 81.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation OATHAuth. This issue affects OATHAuth: from * before 1.43.7, 1.44.4, 1.45.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mediawiki | 1:1.39.17-1+deb12u2 | DEBIAN-CVE-2026-34087 |
| Debian:13 | mediawiki | 1:1.43.8+dfsg-1~deb13u1 | DEBIAN-CVE-2026-34087 |
| Debian:14 | mediawiki | 1:1.43.8+dfsg-1 | DEBIAN-CVE-2026-34087 |
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2026-34087 |
| Ubuntu:26.04:LTS | mediawiki | 1:1.43.8+dfsg-2 | UBUNTU-CVE-2026-34087 |
| Ubuntu:26.10 | mediawiki | 1:1.43.8+dfsg-2 | UBUNTU-CVE-2026-34087 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wikimedia Foundation | OATHAuth | * – before 1.43.7, 1.44.4, 1.45.2 |
Weakness: CWE-200 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/S:N/AU:Y/R:A/RE:M