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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (22.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- N8n — versions 0, 1.123.18, 2.0.0
Weakness classification (CWE)
References
- github.com/n8n-io/n8n/security/advisories/GHSA-38c7-23hj-2wgq (vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/n8n-webhook-forgery-via-unsigned-post-requests-in-… (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.