CVE-2026-105210
Published:October 04, 2026
Updated:October 10, 2026
ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains a missing authentication flaw in the hosted Login V1 UI, whose second-factor enrollment and initialization handlers act on an identify-only session before any primary factor is verified. Attackers knowing only a victim's login name can enroll attacker-controlled TOTP, OTP-SMS, OTP-Email, or U2F factors, overwrite the verified phone number, and enumerate users through discrepant errors.
Affected Packages
https://github.com/zitadel/zitadel.git (GITHUB):
Affected version(s) >=v0.20.0 <v3.4.15Fix Suggestion:
Update to version v3.4.15https://github.com/zitadel/zitadel.git (GITHUB):
Affected version(s) >=v4.0.0 <v4.17.1Fix Suggestion:
Update to version v4.17.1github.com/zitadel/zitadel (GO):
Affected version(s) >=v4.0.0 <v4.17.1Fix Suggestion:
Update to version v4.17.1github.com/zitadel/zitadel (GO):
Affected version(s) >=v1.80.0-lower-headers.1 <v3.4.15Fix Suggestion:
Update to version v3.4.15Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Authentication
EPSS
Base Score:
0.24