n8n - Webhook Forgery via Missing HMAC-SHA256 Signature Verification in GitHub Webhook Trigger
Priority LOW 28CWE-290Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-290.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00314 24th percentileScored 2026-11-07
Fix Fixed n8n (n8n): 1.123.15, 2.5.0n8n (npm): 1.123.15, 2.5.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| n8n | n8n | before 1.123.15; 2.0.0 to before 2.5.0 | 1.123.15, 2.5.0 | Patch available | CNA |
| — | n8n (npm) | before 1.123.15 | 1.123.15 | Patch available | GHSA-mqpr-49jj-32rc |
| — | n8n (npm) | 2.0.0 to before 2.5.0 | 2.5.0 | Patch available | GHSA-mqpr-49jj-32rc |
- n8n Vendorn8n Affected before 1.123.15; 2.0.0 to before 2.5.0 Fixed in 1.123.15, 2.5.0 Patch available CNA
- n8n (npm) Vendor— Affected before 1.123.15 Fixed in 1.123.15 Patch available GHSA-mqpr-49jj-32rc
- n8n (npm) Vendor— Affected 2.0.0 to before 2.5.0 Fixed in 2.5.0 Patch available GHSA-mqpr-49jj-32rc
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:n8n:n8n:*:*:*:*:community:node.js:*:* | before 1.123.15 | Vulnerable | n8n |
| cpe:2.3:a:n8n:n8n:*:*:*:*:enterprise:node.js:*:* | before 1.123.15 | Vulnerable | n8n |
| cpe:2.3:a:n8n:n8n:*:*:*:*:community:node.js:*:* | 2.0.0 to before 2.5.0 | Vulnerable | n8n |
| cpe:2.3:a:n8n:n8n:*:*:*:*:enterprise:node.js:*:* | 2.0.0 to before 2.5.0 | Vulnerable | n8n |
- cpe:2.3:a:n8n:n8n:*:*:*:*:community:node.js:*:* Versions before 1.123.15 Vulnerable ·n8n
- cpe:2.3:a:n8n:n8n:*:*:*:*:enterprise:node.js:*:* Versions before 1.123.15 Vulnerable ·n8n
- cpe:2.3:a:n8n:n8n:*:*:*:*:community:node.js:*:* Versions 2.0.0 to before 2.5.0 Vulnerable ·n8n
- cpe:2.3:a:n8n:n8n:*:*:*:*:enterprise:node.js:*:* Versions 2.0.0 to before 2.5.0 Vulnerable ·n8n
Remediation
- Fix · CNA n8n (n8n) Fixed in 1.123.15, 2.5.0
- Fix · GHSA-mqpr-49jj-32rc n8n (npm) Fixed in 1.123.15 Advisory →
- Fix · GHSA-mqpr-49jj-32rc n8n (npm) Fixed in 2.5.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-56357
- 2026-10-03 Alias added: GHSA-mqpr-49jj-32rc
References
More N8n vulnerabilities
- TI-2025-42131 n8n Vulnerable to Remote Code Execution via Expression Injection KEVCVSS 3.1CRITICAL 10.0
- TI-2026-17560 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling CVSS 3.1CRITICAL 10.0
- TI-2026-01167 Authenticated users can bypass the Expression sandbox mechanism to achieve full remote… CVSS 3.1CRITICAL 9.9
- TI-2026-00644 Sandbox escape in n8n Python task runner allows for arbitrary code execution on the underlying host. CVSS 3.1CRITICAL 9.9
- TI-2025-35293 An arbitrary file upload vulnerability in the Chat Trigger component of N8N v1.95.3… CVSS 3.1HIGH 8.8
- TI-2023-12275 The n8n package 0.218.0 for Node.js allows Escalation of Privileges. CVSS 3.1HIGH 8.8
Sources
- CVE-2026-56357 · CVE Program
- CVE-2026-56357 · NVD
- FIRST EPSS
- GHSA-mqpr-49jj-32rc · GitHub Advisory Database · CC BY 4.0
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