CVE-2026-105215 ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback
Unauthenticated attackers can pre-create accounts bound to victim identities via forged IdP callbacks, leading to account takeover when victims log in.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105215?
CVE-2026-105215 is a critical authentication bypass vulnerability in zitadel, published on 4 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI because the 'external account not found' registration endpoint trusts client-supplied external identity fields without a completed IdP callback. Unauthenticated attackers can submit forged IDPConfigID and ExternalUserID values to pre-create an account bound to a victim's external IdP identity, which the victim's later genuine external login then signs into.
Weakness: CWE-290
Which versions are affected by CVE-2026-105215?
How do I fix CVE-2026-105215?
No fix has been published for CVE-2026-105215 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-105215 being exploited?
There is no known exploitation of CVE-2026-105215 in the wild and no public exploit code.
Sources
Also known as GHSA-639g-x9rp-hw3x, GHSA-738m-7888-jfv8.