{"id":"CVE-2026-56775","title":"n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs Endpoints","summary":"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 workflo…","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","cvssSource":"cna","cwe":["CWE-863"],"vendor":"n8n","product":"n8n","affected":["n8n < 1.123.55","n8n >= 2.26.0 < 2.26.2","n8n >= 2.0.0-rc.0 < 2.25.7"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-08T14:31:14.368940Z"},"published":"2026-07-08","updated":"2026-10-29","sourceUpdated":"2026-10-29T21:15:58.761Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-56775","references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-664h-gpgq-h6xx","label":"GitHub Security Advisory (GHSA-664h-gpgq-h6xx)"},{"url":"https://www.vulncheck.com/advisories/n8n-incorrect-oauth-scope-validation-in-evaluation-test-runs-endpoints","label":"VulnCheck Advisory: n8n - Incorrect OAuth Scope Validation in Evaluation Test Runs Endpoints"}],"tags":["cve.org"],"epss":0.00302,"epssPercentile":0.23068,"ingestedAt":"2026-11-03T08:39:35.565Z","slug":"CVE-2026-56775","body":"## Overview\n\nn8n 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.\n\n## Affected\n\n- `n8n < 1.123.55`\n- `n8n >= 2.26.0 < 2.26.2`\n- `n8n >= 2.0.0-rc.0 < 2.25.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":29.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}