User Impersonation Affecting n8n package, versions <1.123.18>=2.0.0 <2.6.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-N8N-17900548
- published9 Jul 2026
- disclosed8 Jul 2026
- creditArtemiy,JJ
Introduced: 8 Jul 2026
NewCVE-2026-56360 (opens in a new tab)How to fix?
Upgrade n8n to version 1.123.18, 2.6.2 or higher.
Overview
n8n is a n8n Workflow Automation Tool
Affected versions of this package are vulnerable to User Impersonation in the ZendeskTrigger node, which does not validate the HMAC-SHA256 signature on incoming webhook requests from Zendesk. An attacker can trigger workflows with forged payloads by sending unsigned POST requests carrying arbitrary data to the webhook URL, since the signature is never verified. Exploitation requires knowledge of the webhook URL, and the impact is bounded by what the triggered workflow does with the forged payload in connected systems.
Workaround
This vulnerability can be avoided by restricting network access to the webhook endpoint to known Zendesk IP ranges, so forged requests from other origins cannot reach the trigger.