CVE-2026-105215
9.3
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| zitadel | zitadel | 0 < 4.16.2 | affected |
| zitadel | zitadel | 4.16.2 | unaffected |
| zitadel | zitadel | 0 < 3.4.14 | affected |
| zitadel | zitadel | 3.4.14 | unaffected |
Weaknesses
- CWE-290: Authentication Bypass by Spoofing
References
- https://github.com/zitadel/zitadel/security/advisories/GHSA-738m-7888-jfv8
- https://www.vulncheck.com/advisories/zitadel-before-4.16.2-account-pre-hijacking-via-forged-external-idp-callback
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