Description
n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 fail to verify the x-webflow-signature HMAC in the Webflow Trigger node webhook handler. Unauthenticated attackers can send forged webhook requests with attacker-controlled payloads to trigger workflows and manipulate downstream actions like record creation or API calls.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| n8n-io | n8n | < 1.123.80, 2.0.0 – < 2.39.6, 2.40.0 – < 2.40.1 | 1.123.80 |
Advisories 1
- WID-SEC-2026-3393 n8n: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 1, 2026
References
- GitHub Security Advisory (GHSA-hwv9-jhc7-f7c4) vendor-advisory
- VulnCheck Advisory: n8n before 1.123.80, 2.39.6, and 2.40.1 Missing Webhook Signature Verification third-party-advisory