---
id: CVE-2026-109372
title: >-
  ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication
  bypass in the SAML identity-provider intent callback, which verifies the
  assertion signature using the provider named in the request URL but resolves
  the user fr…
summary: >-
  ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication
  bypass in the SAML identity-provider intent callback, which verifies the
  assertion signature using the provider named in the request URL but resolves
  the user fr…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N'
cwe:
  - CWE-287
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T17:17:35.053'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109372'
references:
  - url: 'https://github.com/zitadel/zitadel/security/advisories/GHSA-x4c7-fpcx-w9q6'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/zitadel-3.0.0-before-4.19.2-account-takeover-via-saml-identity-provider-confusion
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T18:00:08.216Z'
---

## Overview

ZITADEL 4.x before 4.19.2 and 3.x through 3.4.15 contains an authentication bypass in the SAML identity-provider intent callback, which verifies the assertion signature using the provider named in the request URL but resolves the user from the login intent without checking they match. Attackers with organization-administrator permission can register a SAML provider with their own signing key to obtain authenticated sessions as any user linked to another SAML provider on the instance, including in other organizations.

## Remediation

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