CVE-2026-103245 n8n before 1.123.80, 2.39.6, and 2.40.1 Missing Webhook Signature Verification
Unauthenticated attackers can forge Webflow webhook requests to trigger workflows and manipulate data due to missing signature verification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103245?
CVE-2026-103245 is a medium-severity missing authorization vulnerability in n8n-io n8n, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-347
Which versions are affected by CVE-2026-103245?
How do I fix CVE-2026-103245?
Upgrade to a fixed version.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-103245 being exploited?
There is no known exploitation of CVE-2026-103245 in the wild and no public exploit code.
Sources
Also known as GHSA-f4rh-5hw6-wc66, GHSA-hwv9-jhc7-f7c4, MINI-c8vc-gj9w-q277.