---
title: "CVE-2026-109372: ZITADEL - Authentication Bypass"
description: "ZITADEL 4.x < 4.19.2 and 3.x <= 3.4.15 contain an authentication bypass caused by improper assertion signature verification in the SAML identity-provider intent callback, letting attackers with organization-administrator permission authenticate as any user linked to another SAML provider, exploit requires organization-administrator privileges."
url: https://panop.io/threat-heartbeat/CVE-2026-109372/
---

# CVE-2026-109372 ZITADEL - Authentication Bypass

ZITADEL 4.x < 4.19.2 and 3.x <= 3.4.15 contain an authentication bypass caused by improper assertion signature verification in the SAML identity-provider intent callback, letting attackers with organization-administrator permission authenticate as any user linked to another SAML provider, exploit requires organization-administrator privileges.

CVSS base score 8.7 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.37% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-109372)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

12 October 2026

Updated

15 October 2026

Weakness

[CWE-287](https://cwe.mitre.org/data/definitions/287.html)

## Vendor fix

Upgrade to version 4.19.2 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-2026-109372](https://nvd.nist.gov/vuln/detail/CVE-2026-109372)
- [https://github.com/zitadel/zitadel/security/advisories/GHSA-x4c7-fpcx-w9q6](https://github.com/zitadel/zitadel/security/advisories/GHSA-x4c7-fpcx-w9q6)
- [https://www.vulncheck.com/advisories/zitadel-3.0.0-before-4.19.2-account-takeover-via-saml-identity-provider-confusion](https://www.vulncheck.com/advisories/zitadel-3.0.0-before-4.19.2-account-takeover-via-saml-identity-provider-confusion)

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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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