CVE-2026-56357
n8n - Webhook Forgery via Missing HMAC-SHA256 Signature Verification in GitHub Webhook Trigger
CVSS Score
4.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-290 |
| Vendor | n8n |
| Product | n8n |
| Published | Jun 22, 2026 |
Stay Ahead of the Next One
Get instant alerts for n8n n8n
Be the first to know when new medium vulnerabilities affecting n8n n8n are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
n8n / n8n
0 < 1.123.15 2.0.0 < 2.5.0
References
Credits
🔍 simonkoeck