---
id: CVE-2026-56666
title: ZITADEL is an open source identity management platform
summary: >-
  ZITADEL is an open source identity management platform. Prior to 4.15.3,
  ZITADEL's external identity provider handler checks that the local user's
  email is verified but does not verify that the external IdP confirmed
  ownership of the sam…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-287
vendor: zitadel
product: zitadel
affected:
  - zitadel < 4.15.3
published: '2026-07-10'
updated: '2026-07-13'
sourceUpdated: '2026-07-13T19:17:23.487'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56666'
references:
  - url: >-
      https://github.com/zitadel/zitadel/commit/c97012f0c5dc2fe960ae6e940cbea23229f0557f
    label: security-advisories@github.com
  - url: 'https://github.com/zitadel/zitadel/releases/tag/v4.15.3'
    label: security-advisories@github.com
  - url: 'https://github.com/zitadel/zitadel/security/advisories/GHSA-992q-9gwp-7r79'
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-56666'
  - url: 'https://github.com/zitadel/zitadel'
tags:
  - nvd
  - cve.org
  - osv
  - go
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-13T18:09:40.948313Z'
ingestedAt: '2026-09-13T03:59:59.172Z'
epss: 0.00285
epssPercentile: 0.18773
aliases:
  - GHSA-992q-9gwp-7r79
  - GO-2026-6470
ecosystem: go
patched:
  - github.com/zitadel/zitadel 4.15.3
---

## Overview

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's external identity provider handler checks that the local user's email is verified but does not verify that the external IdP confirmed ownership of the same email before auto-linking by email, allowing a permissive provider account with a victim email address to be linked to the victim's local account. This issue is fixed in version 4.15.3.

## Remediation

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

## Package advisory (CVE-2026-56666)

Affected packages:

- `github.com/zitadel/zitadel < 4.15.3`

Patched in:

- `github.com/zitadel/zitadel 4.15.3`

Source: https://osv.dev/vulnerability/GHSA-992q-9gwp-7r79