CVE-2026-105215
Published:October 04, 2026
Updated:October 10, 2026
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 Packages
https://github.com/zitadel/zitadel.git (GITHUB):
Affected version(s) >=v1.28.3 <v3.4.14Fix Suggestion:
Update to version v3.4.14https://github.com/zitadel/zitadel.git (GITHUB):
Affected version(s) >=v4.0.0 <v4.16.2Fix Suggestion:
Update to version v4.16.2github.com/zitadel/zitadel (GO):
Affected version(s) >=v1.80.0-lower-headers.1 <v3.4.14Fix Suggestion:
Update to version v3.4.14github.com/zitadel/zitadel (GO):
Affected version(s) >=v4.0.0 <v4.16.2Fix Suggestion:
Update to version v4.16.2Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Spoofing
EPSS
Base Score:
0.34