GHSA-664h-gpgq-h6xx n8n: Wrong OAuth Scope on Evaluation Test Runs Endpoints

• npm n8n: < 1.123.55 → fixed in 1.123.55 • npm n8n: >= 2.26.0, < 2.26.2 → fixed in 2.26.2 • npm n8n: >= 2.0.0-rc.0, < 2.25.7 → fixed in 2.25.7

Impact Three mutating endpoints in the evaluation test runs controller authorized state-changing actions using `workflow:read` instead of the action-appropriate `workflow:execute` scope. An authenticated user with `project:viewer` role on a project could start new evaluation test runs, cancel in-flight runs, and delete run records for workflows they only had read access to. This issue only affects instances with Advanced Permissions (Enterprise/Cloud) where projects and viewer roles are in use. Patches The issue has been fixed in n8n versions 1.123.55, 2.25.7, and 2.26.2. Users should upgrade to one of these versions or later to remediate the vulnerability. Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: • Restrict project membership to fully trusted users only. • Avoid granting viewer access to projects containing sensitive workflows. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.