---
title: "CVE-2026-105211: ZITADEL - Authentication Bypass"
description: "ZITADEL < 4.17.1 contains an authentication bypass caused by OTP code exposure via returnCode delivery type in Login V2, letting unauthenticated attackers take over accounts including administrators, exploit requires victim to have OTP-Email and OTP-SMS enrolled."
url: https://panop.io/threat-heartbeat/CVE-2026-105211/
---

# CVE-2026-105211 ZITADEL - Authentication Bypass

ZITADEL < 4.17.1 contains an authentication bypass caused by OTP code exposure via returnCode delivery type in Login V2, letting unauthenticated attackers take over accounts including administrators, exploit requires victim to have OTP-Email and OTP-SMS enrolled.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.33% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-105211)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

4 October 2026

Updated

15 October 2026

Weakness

[CWE-200](https://cwe.mitre.org/data/definitions/200.html)

## Vendor fix

Update to version 4.17.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-105211](https://nvd.nist.gov/vuln/detail/CVE-2026-105211)
- [https://www.vulncheck.com/advisories/zitadel-before-4.17.1-authentication-bypass-via-login-v2-otp-returncode](https://www.vulncheck.com/advisories/zitadel-before-4.17.1-authentication-bypass-via-login-v2-otp-returncode)
- [https://github.com/zitadel/zitadel/security/advisories/GHSA-3gwm-5wx8-4gm6](https://github.com/zitadel/zitadel/security/advisories/GHSA-3gwm-5wx8-4gm6)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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