What is CVE-2026-56360?

CVE-2026-56360 is a medium-severity vulnerability in N8n, classified under Authentication Bypass by Spoofing. CVSS score: 4.0/10. Published 2026-07-08.

How severe is CVE-2026-56360?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Vulnerability in N8n

CVE-2026-56360

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.

EPSS: 0.002 (8.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

N8n — versions 0, 1.123.18, 2.0.0

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

disclosure@vulncheck.com (vendor-advisory, Mitigation, Vendor Advisory)
disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-56360?: CVE-2026-56360 is a medium-severity vulnerability in N8n, classified under Authentication Bypass by Spoofing. CVSS score: 4.0/10. Published 2026-07-08.
How severe is CVE-2026-56360?: Medium severity. CVSS v3 base score is 4.0 out of 10.