CVE-2026-56360

n8n - Webhook Forgery via Unsigned POST Requests in ZendeskTrigger

State: Published
Severity: 6.3 Medium
Published: Jul 8, 2026
Updated: Jul 8, 2026
Reserved: Jun 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N	VulnCheck
3.1	4.0 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N	VulnCheck

Weaknesses

CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
n8nn8n	before 1.123.18Affected 1.123.18Not affected 2.0.0 to before 2.6.2Affected 2.6.2Not affected

References

GitHub Security Advisory (GHSA-38c7-23hj-2wgq)vendor-advisory
VulnCheck Advisory: n8n - Webhook Forgery via Unsigned POST Requests in ZendeskTriggerthird-party-advisory

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