Webhook Forgery Vulnerability in n8n: Exploitable Zendesk Trigger Node
Summary
GHSA-38c7-23hj-2wgq: n8n has Webhook Forgery on Zendesk Trigger Node. Affects n8n across 2 version ranges.
< 1.123.18
>= 2.0.0, < 2.6.2
Fixed in 1.123.18 or 2.6.2, depending on the release line you run. How to fix ↓
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Background
n8n is an open-source workflow automation tool that allows users to connect various applications and services through customizable workflows. It features a user-friendly interface for creating automated tasks and supports a wide range of integrations. However, a vulnerability has been identified in the Zendesk Trigger Node, which could allow unauthorized users to exploit webhook functionality.
Vulnerability Detail
The vulnerability arises from the lack of verification of the HMAC-SHA256 signature in the Zendesk Trigger Node of n8n. An attacker who knows the webhook URL can send unsigned POST requests, triggering workflows with arbitrary data. This could lead to unauthorized actions being performed within the connected applications, potentially compromising sensitive information or workflows.
How To Fix
Latest published version: 2.44.6 as of 22 Oct 2026
npm install n8n@2.44.6Upgrading to it may include breaking changes; the versions below are the minimum fixed release for this vulnerability.
If you can't move to the latest
The minimum fixed version depends on the release line you run.
-
< 1.123.181.123.18npm install n8n@1.123.18 -
>= 2.0.0, < 2.6.22.6.2npm install n8n@2.6.2
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
If immediate upgrading is not possible, consider implementing the following temporary mitigations:
- Limit workflow creation and editing permissions to fully trusted users only.
- Restrict network access to the n8n webhook endpoint to known Zendesk IP ranges.
Conclusion
The Webhook Forgery vulnerability in n8n's Zendesk Trigger Node poses a significant risk by allowing unauthorized access to workflows. Users are strongly advised to upgrade to the patched versions to mitigate this risk. Temporary workarounds can be employed until an upgrade is feasible.
See every vulnerability recorded for n8n →
FAQ
The vulnerability allows attackers to send unsigned POST requests to the Zendesk Trigger Node, potentially triggering workflows with malicious data.
You can check your n8n version and compare it with the patched versions (2.6.2 or 1.123.18). Additionally, you can use Vulert to monitor for vulnerabilities.
An attacker could exploit this vulnerability to manipulate workflows, leading to unauthorized actions and potential data breaches.
Yes, you can limit access to the webhook endpoint and restrict permissions for workflow creation and editing to trusted users.
Vulert is a tool that monitors open-source vulnerabilities in your software using the package-lock.json file. It provides real-time alerts and can help you determine if your application is affected by vulnerabilities like this one.
References
Related vulnerabilities
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