CVE-2026-105206 ZITADEL before 4.17.3 Cross-Organization Authentication Method Enumeration via User Service
Authenticated users can enumerate authentication methods of users in other organizations due to incorrect authorization checks in the User Service API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105206?
CVE-2026-105206 is a medium-severity missing authorization vulnerability in zitadel, published on 4 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
ZITADEL 3.0.0 through 3.4.15 and 4.x before 4.17.3 contains an incorrect authorization flaw in the User Service API, which verifies user.read against the caller's organization rather than the organization owning the target user. An authenticated member holding org-scoped user.read can query GET /v2/users/{userId}/authentication_methods to learn which authentication method types users in other organizations have registered.
Weakness: CWE-863
Which versions are affected by CVE-2026-105206?
How do I fix CVE-2026-105206?
No fix has been published for CVE-2026-105206 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-105206 being exploited?
There is no known exploitation of CVE-2026-105206 in the wild and no public exploit code.
Sources
Also known as GHSA-j344-gqv4-84ff, GHSA-pmw5-r3fq-5gm7.