---
id: CVE-2026-105210
title: >-
  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 ver…
summary: >-
  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 ver…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N'
cwe:
  - CWE-287
vendor: zitadel
product: zitadel
affected:
  - zitadel < 4.17.1
  - zitadel < 3.4.15
published: '2026-10-04'
updated: '2026-10-04'
sourceUpdated: '2026-10-04T15:16:32.287'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105210'
references:
  - url: 'https://github.com/zitadel/zitadel/security/advisories/GHSA-72q5-mv5c-vxv4'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/zitadel-before-4.17.1-unauthenticated-mfa-enrollment-via-login-v1-init-handlers
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-04T15:00:34.392Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.