{"id":"GHSA-pm35-fqvh-cq5g","revision":"33edb15fcea448b1b08aca2b4c06e802","records":[{"revision":"33edb15fcea448b1b08aca2b4c06e802","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-pm35-fqvh-cq5g","aliases":["CVE-2026-65591"],"title":"n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution","description":"## Impact\nThe legacy expression evaluator's computed-member sanitizer can be bypassed by an authenticated user with workflow create or modify permissions. Successful exploitation grants the attacker host-level code execution as the n8n process.\n\nThe legacy expression engine is the default engine in affected versions.\n\n## Patches\nThe issue has been fixed in n8n versions 1.123.64, 2.29.8, and 2.30.1. 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 n8n instance access to fully trusted users only.\n- Switch to the non-legacy expression engine by setting `N8N_EXPRESSION_ENGINE=vm`.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.","state":0,"publishedAt":"2026-07-22T22:02:04+00:00","modifiedAt":"2026-07-22T22:26:48.485772+00:00","affected":[{"ecosystem":"npm","name":"n8n","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.123.64"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"n8n","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.30.0"},{"kind":"fixed","version":"2.30.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"n8n","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.0.0-rc.0"},{"kind":"fixed","version":"2.29.8"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/n8n-io/n8n/security/advisories/GHSA-pm35-fqvh-cq5g","https://nvd.nist.gov/vuln/detail/CVE-2026-65591","https://github.com/n8n-io/n8n","https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.64","https://github.com/n8n-io/n8n/releases/tag/n8n@2.29.8","https://github.com/n8n-io/n8n/releases/tag/n8n@2.30.1","https://www.vulncheck.com/advisories/n8n-before-sanitizer-bypass-remote-code-execution"],"sourceUrl":"https://github.com/advisories/GHSA-pm35-fqvh-cq5g","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-pm35-fqvh-cq5g","identifiers":["GHSA-pm35-fqvh-cq5g","CVE-2026-65591"]},"retained":false,"historicalAffected":[]}],"coverage":[]}