What is CVE-2026-56357?

CVE-2026-56357 is a medium-severity vulnerability in N8n, classified under Authentication Bypass by Spoofing. CVSS score: 4.0/10. Published 2026-06-22.

How severe is CVE-2026-56357?

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

Vulnerability in N8n

CVE-2026-56357

n8n before 1.123.15 and 2.5.0 contains a webhook forgery vulnerability in the GitHub Webhook Trigger node that fails to implement HMAC-SHA256 signature verification. Attackers who know the webhook URL can send unsigned POST requests to tri…

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, 1.123.15, 2.0.0

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-56357?: CVE-2026-56357 is a medium-severity vulnerability in N8n, classified under Authentication Bypass by Spoofing. CVSS score: 4.0/10. Published 2026-06-22.
How severe is CVE-2026-56357?: Medium severity. CVSS v3 base score is 4.0 out of 10.