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9.3

ZITADEL can let attackers create fake accounts linked to real users

CVE-2026-105215 · published 14 days ago
Summary

If you use ZITADEL versions before 4.16.2, an attacker can trick the login page into setting up an account that appears to belong to a legitimate external identity provider. When the real user later logs in with that provider, they will be signed into the attacker‑created account. Update ZITADEL to the latest version or apply the vendor’s patch to stop this behavior.

Original advisory text
ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback
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.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker full control
Severity
9.3 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-290Authentication Bypass by Spoofing
Timeline
Published4 Oct 2026
Updated15 Oct 2026
First seen4 Oct 2026
Sources
CVE-2026-105215 · NVD
CVE-2026-105215 · OSV
GHSA-738m-7888-jfv8 · GHSA
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