CVE-2026-56360 Details
Description
n8n before versions 1.123.18 and 2.6.2 fails to verify HMAC-SHA256 signatures on Zendesk webhooks in the ZendeskTrigger node. Attackers who know the webhook URL can send unsigned POST requests to trigger workflows with arbitrary malicious data.
A vulnerability exists in n8n versions prior to 1.123.18 and between 2.0.0 and 2.6.2, where the ZendeskTrigger node does not properly verify HMAC-SHA256 signatures on webhooks from Zendesk. This flaw allows attackers who are aware of the webhook URL to send unsigned POST requests, triggering workflows with arbitrary malicious data. The lack of signature verification enables the injection of crafted payloads into the workflow.
Users can upgrade to n8n versions 2.6.2 or 1.123.18 to address this vulnerability. If an immediate upgrade is not possible, it is recommended to limit workflow creation and editing permissions to trusted users and to restrict network access to the n8n webhook endpoint to known Zendesk IP ranges.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 8, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgq | [email protected] | MitigationVendor Advisory |
| https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-unsigned-post-requests-in-zendesktrigger | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-290 | Authentication Bypass by Spoofing | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| n8n n8n | < 1.123.18 >= 2.0.0, < 2.6.2 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 8, 2026 | Initial Analysis | [email protected] |
| Jul 8, 2026 | CVE Modified | CISA-ADP |
| Jul 8, 2026 | New CVE Received | [email protected] |