CVE-2026-56357
MEDIUM
NVD
CVSS Score
4
Severity
MEDIUM
Published
Jun 22, 2026
Vendor
unknown
Description
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 trigger workflows with arbitrary data, spoofing GitHub webhook events.