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.
Advisories

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Fixes

Solution

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Workaround

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History

Sun, 04 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
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
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-04T13:10:07.389Z

Reserved: 2026-10-04T13:04:00.478Z

Link: CVE-2026-105215

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-04T15:16:32.993

Modified: 2026-10-04T15:16:33.107

Link: CVE-2026-105215

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-04T15:45:04Z

Weaknesses