CVE-2026-103245: Improper Verification of Cryptographic Signature in n8n-io n8n
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.
AI Analysis
Technical Summary
CVE-2026-103245 describes an improper verification of the cryptographic signature (x-webflow-signature HMAC) in the Webflow Trigger node webhook handler of n8n. Affected versions include all versions before 1.123.80, versions from 2.0.0 up to but not including 2.39.6, and versions from 2.40.0 up to but not including 2.40.1. The flaw allows unauthenticated attackers to forge webhook requests that can trigger workflows and manipulate subsequent automated actions.
Potential Impact
An attacker can send unauthenticated, forged webhook requests to vulnerable n8n instances, causing workflows to execute with attacker-controlled data. This can lead to unauthorized actions such as creating records or making API calls, potentially impacting data integrity and system behavior. The CVSS 4.0 base score is 6.9 (medium severity), reflecting network attack vector, low complexity, no privileges or user interaction required, and limited impact on integrity.
Mitigation Recommendations
Upgrade n8n to version 1.123.80 or later, or to versions 2.39.6 or later if using the 2.x series. These versions include fixes that properly verify the x-webflow-signature HMAC in the Webflow Trigger node webhook handler, preventing exploitation of this vulnerability.
CVE-2026-103245: Improper Verification of Cryptographic Signature in n8n-io n8n
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.
CVSS v4.0
Score 6.9medium
Affected software
n8n-io
n8n
pkg:npm/n8n-io/n8nRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103245 describes an improper verification of the cryptographic signature (x-webflow-signature HMAC) in the Webflow Trigger node webhook handler of n8n. Affected versions include all versions before 1.123.80, versions from 2.0.0 up to but not including 2.39.6, and versions from 2.40.0 up to but not including 2.40.1. The flaw allows unauthenticated attackers to forge webhook requests that can trigger workflows and manipulate subsequent automated actions.
Potential Impact
An attacker can send unauthenticated, forged webhook requests to vulnerable n8n instances, causing workflows to execute with attacker-controlled data. This can lead to unauthorized actions such as creating records or making API calls, potentially impacting data integrity and system behavior. The CVSS 4.0 base score is 6.9 (medium severity), reflecting network attack vector, low complexity, no privileges or user interaction required, and limited impact on integrity.
Mitigation Recommendations
Upgrade n8n to version 1.123.80 or later, or to versions 2.39.6 or later if using the 2.x series. These versions include fixes that properly verify the x-webflow-signature HMAC in the Webflow Trigger node webhook handler, preventing exploitation of this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-30T10:52:32.248Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abe7492a43b0b3b89bd1cdc
Added to database: 10/01/2026, 14:56:18 UTC
Last enriched: 10/01/2026, 15:21:38 UTC
Last updated: 10/02/2026, 01:23:34 UTC
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.