High severity · published May 11, 2026
CVE-2026-34087
Users API leaks whether privileged users have their user groups disabled for lack of 2FA
7.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OA
OATHAuth · Wikimedia Foundation
before 1.43.7, 1.44.4, 1.45.2 · source: vendor
ME
Mediawiki · Mediawiki
before 1.43.7; 1.44.0 before 1.44.4; 1.45.0 before 1.45.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34087
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-34087
Issue Tracking
https://phabricator.wikimedia.org/T412061
More from OATHAuth
0.0
CVE-2025-11173
Reauth for enabling 2FA can be bypassed by submitting a form