| Component | n8n |
| Severity | high (CVSS 7.4) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L |
| Published (NVD) | 2026-07-08 |
| Last modified | 2026-07-09 |
| Affected versions | n8n < 1.123.55 n8n >= 2.0.0, < 2.25.7 n8n >= 2.26.0, < 2.26.2 |
| Fixed in | 1.123.55, 2.25.7, 2.26.2 |
| Weakness | CWE-863 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade n8n to
1.123.55or later (or the patched release of your branch: 2.25.7, 2.26.2). - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-56776
- https://github.com/n8n-io/n8n/security/advisories/GHSA-hv7x-3x78-gx53
- https://www.vulncheck.com/advisories/n8n-incorrect-oauth-scope-validation-in-workflow-test-run-endpoint
Read more
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