Vulnerability Description
n8n before 1.123.55, 2.25.7, and 2.26.2 contains an authorization bypass in the POST /workflows/{workflowId}/test-runs/new endpoint, which authorizes access using the workflow:read scope instead of workflow:execute. An authenticated user with read-only access to a workflow can trigger a real evaluation test run, causing the workflow to execute via the internal workflow runner and resulting in unintended outbound API calls, data mutations, or other side effects in connected downstream systems. The issue primarily affects instances using the Evaluations feature where RBAC project roles grant workflow:read without workflow:execute.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| N8N | N8N | < 1.123.55 |
Related Weaknesses (CWE)
References
- https://github.com/n8n-io/n8n/security/advisories/GHSA-hv7x-3x78-gx53MitigationVendor Advisory
- https://www.vulncheck.com/advisories/n8n-incorrect-oauth-scope-validation-in-worThird Party Advisory
FAQ
What is CVE-2026-56776?
CVE-2026-56776 is a vulnerability with a CVSS score of 7.4 (HIGH). n8n before 1.123.55, 2.25.7, and 2.26.2 contains an authorization bypass in the POST /workflows/{workflowId}/test-runs/new endpoint, which authorizes access using the workflow:read scope instead of wo...
How severe is CVE-2026-56776?
CVE-2026-56776 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56776?
Check the references section above for vendor advisories and patch information. Affected products include: N8N N8N.