CVE-2026-105210

HIGH 8.2

ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers

CVSS Score

8.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-287
Vendor	zitadel
Product	zitadel
Published	Oct 4, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Affected Versions

zitadel / zitadel

0 < 4.17.1

zitadel / zitadel

0 < 3.4.15

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/zitadel/zitadel/security/advisories/GHSA-72q5-mv5c-vxv4 vulncheck.com: https://www.vulncheck.com/advisories/zitadel-before-4.17.1-unauthenticated-mfa-enrollment-via-login-v1-init-handlers

Credits

grvijayan livio-a 🔍 lucasdodgson 🔍 AdamKorcz