CVE-2026-105210

ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers

State: Published
Severity: 8.8 High
Published: Oct 4, 2026
Updated: Oct 29, 2026
Reserved: Oct 4, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.8 High	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	VulnCheck
3.1	8.2 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N	VulnCheck

Weaknesses

CWE-287 Improper Authentication

Affected Products

Product	Versions
zitadelzitadel	4.0.0 to before 4.17.1Affected 4.17.1Not affected
zitadelzitadel	before 3.4.15Affected 3.4.15Not affected

References

GitHub Security Advisory (GHSA-72q5-mv5c-vxv4)vendor-advisory
VulnCheck Advisory: ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlersthird-party-advisory

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