---
id: CVE-2026-105208
title: >-
  ZITADEL 4.x before 4.17.3 and 3.x through 3.4.15 protects IdP intent tokens
  with unauthenticated, malleable encryption, allowing authenticated users to
  tamper with their own token so it is accepted for another user's external
  login inten…
summary: >-
  ZITADEL 4.x before 4.17.3 and 3.x through 3.4.15 protects IdP intent tokens
  with unauthenticated, malleable encryption, allowing authenticated users to
  tamper with their own token so it is accepted for another user's external
  login inten…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N'
cwe:
  - CWE-649
vendor: zitadel
product: zitadel
affected:
  - zitadel < 4.17.3
  - zitadel <= 4.19.4
published: '2026-10-04'
updated: '2026-10-04'
sourceUpdated: '2026-10-04T15:16:31.963'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-105208'
references:
  - url: 'https://github.com/zitadel/zitadel/security/advisories/GHSA-jh3m-cr2x-qp88'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/zitadel-before-4.17.3-session-hijacking-via-forgeable-idp-intent-tokens
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-04T15:00:34.386Z'
---

## Overview

ZITADEL 4.x before 4.17.3 and 3.x through 3.4.15 protects IdP intent tokens with unauthenticated, malleable encryption, allowing authenticated users to tamper with their own token so it is accepted for another user's external login intent. An attacker who predicts a victim's in-flight intent identifier and wins a timing race can call /v2/idp_intents or /v2/sessions to steal the victim's IdP tokens or hijack their session.

## Remediation

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