CVE-2026-56357

脆弱性の種類

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.

影響を受ける製品

• n8n n8n

参考情報

• https://github.com/n8n-io/n8n/security/advisories/GHSA-mqpr-49jj-32rc
• https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-missing-hmac-sha256-signature-verification-in-github-webhook-trigger