Authentication Bypass by Spoofing in n8n - #VU127203
Published: April 23, 2026
Vulnerability identifier: #VU127203
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-290
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: n8n
Affected software:
n8n
n8n
Detailed vulnerability description
The vulnerability allows a remote attacker to trigger the workflow with arbitrary data.
The vulnerability exists due to authentication bypass by spoofing in the GitHub Webhook Trigger node when handling webhook POST requests. A remote attacker can send unsigned POST requests to trigger the workflow with arbitrary data.
Exploitation requires knowledge of the webhook URL.
Remediation
Install security update from vendor's website.