{"id":"CVE-2026-56775","aliases":["GHSA-664h-gpgq-h6xx"],"url":"https://o3.security/vulnerability/CVE-2026-56775","summary":"n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs Endpoints","details":"## Impact\nThree 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.\n\nThis issue only affects instances with Advanced Permissions (Enterprise/Cloud) where projects and viewer roles are in use.\n\n## Patches\nThe 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.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Restrict project membership to fully trusted users only.\n- Avoid granting viewer access to projects containing sensitive workflows.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","published":"2026-07-08T13:49:06.267Z","modified":"2026-10-21T02:31:05.467681435Z","cvss":null,"epss":{"score":0.00302,"percentile":0.22762,"asOf":"2026-09-12"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"n8n","fixedVersion":"1.123.55"},{"ecosystem":"npm","name":"n8n","fixedVersion":"2.26.2"},{"ecosystem":"npm","name":"n8n","fixedVersion":"2.25.7"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56775.json"},{"type":"ADVISORY","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-664h-gpgq-h6xx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56775"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/n8n-incorrect-oauth-scope-validation-in-evaluation-test-runs-endpoints"},{"type":"PACKAGE","url":"https://github.com/n8n-io/n8n"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:31:05.467681435Z"}}