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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Sun, 04 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Description 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.
Title ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers
First Time appeared Zitadel
Zitadel zitadel
Weaknesses CWE-287
CPEs cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:*
Vendors & Products Zitadel
Zitadel zitadel
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N'}

cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-04T13:10:03.949Z

Reserved: 2026-10-04T13:02:21.188Z

Link: CVE-2026-105210

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-10-04T15:16:32.170

Modified: 2026-10-04T15:16:32.287

Link: CVE-2026-105210

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-04T16:30:15Z

Weaknesses