CVE-2026-105207 ZITADEL before 4.17.3 Account Takeover via External IdP Linking

Critical 9.3 Published 4 Oct 2026 Updated 29 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-105207?

CVE-2026-105207 is a critical vulnerability in zitadel, published on 4 Oct 2026.

Official description

ZITADEL 3.0.0 through 3.4.15 and 4.0.0 before 4.17.3 creates links between user accounts and external identity providers without verifying a primary factor or the caller's permission, including on identify-only Login V2 sessions and via the User Service V2 AddIDPLink endpoint. An unauthenticated attacker knowing a victim's login name can bind their own external IdP identity to the victim's account and then sign in as the victim.

Weakness: CWE-306

Which versions are affected by CVE-2026-105207?

How do I fix CVE-2026-105207?

No fix has been published for CVE-2026-105207 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-105207 being exploited?

There is no known exploitation of CVE-2026-105207 in the wild and no public exploit code.

Sources

Also known as GHSA-98x8-wvr5-pxqj, GHSA-g8gj-gq47-xgf4.