Vulnerability DatabaseCVE-2026-56357
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CVE-2026-56357
Published:June 22, 2026
Updated:June 29, 2026
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.
Affected Packages
n8n (NPM):
Affected version(s) >=2.0.0 <2.5.0
Fix Suggestion:
Update to version 2.5.0
n8n (NPM):
Affected version(s) >=0.0.1 <1.123.15
Fix Suggestion:
Update to version 1.123.15
Related Resources (5)
https://github.com/n8n-io/n8n
https://github.com/n8n-io/n8n/commit/a19347a6bc9a96d5065ac77d25a811e46178c578
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
https://github.com/n8n-io/n8n/commit/afe322325502f448b33bff1db1575e4447c28a36
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
4
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Authentication Bypass by Spoofing
CWE-290
EPSS
Base Score:
0.19