medium4.0
CVE-2026-56357
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 verific…
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | n8n | < 1.123.15 | 1.123.15 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| N8n | N8n | before 1.123.15 from 2.0.0 before 2.5.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-mqpr-49jj-32rc
- https://github.com/n8n-io/n8n/security/advisories/GHSA-mqpr-49jj-32rc
- https://github.com/n8n-io/n8n/commit/a19347a6bc9a96d5065ac77d25a811e46178c578
- https://github.com/n8n-io/n8n/commit/afe322325502f448b33bff1db1575e4447c28a36
- https://nvd.nist.gov/vuln/detail/CVE-2026-56357
- https://www.vulncheck.com/advisories/n8n-webhook-forgery-via-missing-hmac-sha256-signature-verification-in-github-webhook-trigger