CVE-2026-56775: n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs Endpoints
n8n before 1.123.55, 2.25.7, and 2.26.2 contains an authorization vulnerability in three mutating evaluation test-run endpoints that authorize state-changing actions using the workflow:read scope instead of the action-appropriate workflow:execute scope. On instances using Advanced Permissions (Enterprise/Cloud) with projects and viewer roles, an authenticated user with the project:viewer role can start new evaluation test runs, cancel in-flight runs, and delete run records for workflows they only have read access to.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-56775?
The severity of CVE-2026-56775 is rated as medium with a score of 5.4.
How do I fix CVE-2026-56775?
To fix CVE-2026-56775, upgrade n8n to version 1.123.55, 2.25.7, or 2.26.2.
What does CVE-2026-56775 involve?
CVE-2026-56775 involves an authorization vulnerability in n8n that improperly uses the workflow:read scope for state-changing actions.
Which versions of n8n are affected by CVE-2026-56775?
n8n versions before 1.123.55, 2.25.7, and 2.26.2 are affected by CVE-2026-56775.
What type of permissions issue is related to CVE-2026-56775?
CVE-2026-56775 relates to incorrect OAuth scope validation for evaluation test-run endpoints in n8n.