{"id":"GHSA-pm35-fqvh-cq5g","summary":"n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution","details":"## 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.","aliases":["CVE-2026-65591"],"modified":"2026-07-22T22:26:48.485772Z","published":"2026-07-22T22:02:04Z","database_specific":{"cwe_ids":["CWE-917"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-07-22T22:02:04Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-pm35-fqvh-cq5g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65591"},{"type":"PACKAGE","url":"https://github.com/n8n-io/n8n"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.64"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.29.8"},{"type":"WEB","url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.30.1"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/n8n-before-sanitizer-bypass-remote-code-execution"}],"affected":[{"package":{"name":"n8n","ecosystem":"npm","purl":"pkg:npm/n8n"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.123.64"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-pm35-fqvh-cq5g/GHSA-pm35-fqvh-cq5g.json"}},{"package":{"name":"n8n","ecosystem":"npm","purl":"pkg:npm/n8n"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.30.0"},{"fixed":"2.30.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-pm35-fqvh-cq5g/GHSA-pm35-fqvh-cq5g.json"}},{"package":{"name":"n8n","ecosystem":"npm","purl":"pkg:npm/n8n"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.0.0-rc.0"},{"fixed":"2.29.8"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-pm35-fqvh-cq5g/GHSA-pm35-fqvh-cq5g.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}