Vulnerability · Published Oct 1, 2026 · Assigned by VulnCheck
CVE-2026-103245n8n before 1.123.80, 2.39.6, and 2.40.1 Missing Webhook Signature Verification
Medium 5.3
In plain English
A medium-severity security flaw in n8n from n8n-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.2%top 95.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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