CVE-2026-34087 Users API leaks whether privileged users have their user groups disabled for lack of 2FA
Attackers can determine if privileged users have disabled user groups due to missing 2FA, exposing sensitive security status information.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-34087?
CVE-2026-34087 is a medium-severity vulnerability in Mediawiki Mediawiki, published on 11 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
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.
Weakness: CWE-200
Which versions are affected by CVE-2026-34087?
It affects 1 product.
Products include Mediawiki Mediawiki.
How do I fix CVE-2026-34087?
Upgrade to a fixed version.
Is CVE-2026-34087 being exploited?
There is no known exploitation of CVE-2026-34087 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as DEBIAN-CVE-2026-34087, GHSA-6fcc-jw5f-pvm9, UBUNTU-CVE-2026-34087.