CVE-2026-105215

9.1 CRITICALpublic exploit available

Published 2026-10-04 · Updated 2026-10-05

AI risk analysis

Summary: The flaw allows unauthenticated attackers to bypass authentication by pre-creating an account using forged external identity fields, posing a significant security risk.
Exploitability: Exploitation is relatively easy as it requires submitting forged IDPConfigID and ExternalUserID values without a completed IdP callback.
Blast radius: If exploited, this could lead to unauthorized access to sensitive systems and data, compromising user accounts and potentially the entire system.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to ZITADEL 3.4.14 or 4.16.2 or later.

auth-bypasswebexternal-identityunauthenticated

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE-290

Public exploit & PoC references

https://github.com/zitadel/zitadel/security/advisories/GHSA-738m-7888-jfv8

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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