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.
Metrics
Affected Vendors & Products
References
History
Mon, 05 Oct 2026 14:30:00 +0000
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| Metrics |
ssvc
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Sun, 04 Oct 2026 14:30:00 +0000
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| 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. | |
| Title | ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback | |
| First Time appeared |
Zitadel
Zitadel zitadel |
|
| Weaknesses | CWE-290 | |
| CPEs | cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Zitadel
Zitadel zitadel |
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| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-10-04T13:10:07.389Z
Updated: 2026-10-05T13:28:36.853Z
Reserved: 2026-10-04T13:04:00.478Z
Link: CVE-2026-105215
Updated: 2026-10-05T13:28:33.130Z
Status : Deferred
Published: 2026-10-04T15:16:32.993
Modified: 2026-10-05T14:17:18.137
Link: CVE-2026-105215
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