---
id: CVE-2026-103256
title: >-
  n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a credentials leak
  vulnerability in the Wekan and Baserow username-and-password credentials that
  sends unencrypted passwords to unvalidated hosts
summary: >-
  n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a credentials leak
  vulnerability in the Wekan and Baserow username-and-password credentials that
  sends unencrypted passwords to unvalidated hosts. Attackers with credential
  upda…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N'
cwe:
  - CWE-522
vendor: n8n-io
product: n8n
affected:
  - n8n < 2.39.6
  - n8n >= 2.40.0 < 2.40.1
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T11:17:20.047'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103256'
references:
  - url: 'https://github.com/n8n-io/n8n/security/advisories/GHSA-gx6g-2hm7-c4xf'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/n8n-before-2.39.6-and-2.40-x-before-2.40.1-credentials-leak-via-preauthentication-hook
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-01T11:42:53.802Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-01T13:27:54.726455Z'
---

## Overview

n8n versions before 2.39.6 and 2.40.0 before 2.40.1 contain a credentials leak vulnerability in the Wekan and Baserow username-and-password credentials that sends unencrypted passwords to unvalidated hosts. Attackers with credential update permissions can modify the host field to receive account passwords at arbitrary hosts, bypassing domain validation controls.

## Remediation

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