CVE-2026-105215
CRITICAL
CVSS 9.1
Published: 2026-10-04
Modified: 2026-10-05
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Threat Intelligence Pending
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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.
Quick Facts
| CVE ID | CVE-2026-105215 |
| CVSS Score | 9.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| Published | 2026-10-04 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |