---
id: CVE-2026-65014
aliases:
  - GHSA-33q9-f52j-gc75
title: >-
  n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test
  Webhook
summary: >-
  n8n: Unauthenticated Endpoint Allows Cancellation of Any User's Active Test
  Webhook
severity: medium
cwe:
  - CWE-306
vendor: n8n
product: n8n
ecosystem: npm
affected:
  - n8n < 2.27.4
patched:
  - n8n 2.27.4
published: '2026-07-22'
updated: '2026-07-22'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-33q9-f52j-gc75'
references:
  - url: 'https://github.com/n8n-io/n8n/security/advisories/GHSA-33q9-f52j-gc75'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65014'
  - url: 'https://github.com/n8n-io/n8n/releases/tag/n8n@2.27.4'
  - url: 'https://github.com/n8n-io/n8n/releases/tag/n8n@2.28.0'
  - url: >-
      https://www.vulncheck.com/advisories/n8n-before-authentication-bypass-via-test-webhook
  - url: 'https://github.com/advisories/GHSA-33q9-f52j-gc75'
tags:
  - ghsa
  - npm
ingestedAt: '2026-07-22T23:07:32.605Z'
epss: 0.00334
epssPercentile: 0.26847
---

## Overview

## Impact
The `DELETE /${restEndpoint}/test-webhook/:id` route is registered before the authentication middleware is applied, allowing any unauthenticated network caller who knows a workflow ID to cancel that workflow's active test webhook registration. 

The impact is limited to disrupting in-progress test sessions. Production webhooks, persistent workflow state, and stored data are not affected.

## Patches
Users should upgrade to the patched version once available to remediate the vulnerability.

## Workarounds
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Restrict network access to the n8n instance to fully trusted users only.
- Place the n8n instance behind a reverse proxy or firewall that requires authentication before reaching the REST API.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

## Affected packages

- `n8n < 2.27.4`

## Remediation

Upgrade to a patched release:

- `n8n 2.27.4`