{"id":"CVE-2026-65591","aliases":["GHSA-pm35-fqvh-cq5g"],"title":"n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution","summary":"n8n: Legacy Expression Evaluator Sanitizer Bypass Leads to Authenticated Code Execution","severity":"high","cwe":["CWE-917"],"vendor":"n8n","product":"n8n","ecosystem":"npm","affected":["n8n < 1.123.64","n8n >= 2.30.0, < 2.30.1","n8n >= 2.0.0-rc.0, < 2.29.8"],"patched":["n8n 1.123.64","n8n 2.30.1","n8n 2.29.8"],"published":"2026-07-22","updated":"2026-07-22","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-pm35-fqvh-cq5g","references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-pm35-fqvh-cq5g"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65591"},{"url":"https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.64"},{"url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.29.8"},{"url":"https://github.com/n8n-io/n8n/releases/tag/n8n@2.30.1"},{"url":"https://www.vulncheck.com/advisories/n8n-before-sanitizer-bypass-remote-code-execution"},{"url":"https://github.com/advisories/GHSA-pm35-fqvh-cq5g"}],"tags":["ghsa","npm","exploit-available"],"ingestedAt":"2026-07-22T22:06:57.404Z","epss":0.00481,"epssPercentile":0.40504,"exploits":{"github":1,"githubRepos":["https://github.com/IamDremig/CVE-2026-65591"],"checkedAt":"2026-09-21T15:30:08.747Z"},"exploitAvailable":true,"slug":"CVE-2026-65591","body":"## Overview\n\n## 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.\n\n## Affected packages\n\n- `n8n < 1.123.64`\n- `n8n >= 2.30.0, < 2.30.1`\n- `n8n >= 2.0.0-rc.0, < 2.29.8`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `n8n 1.123.64`\n- `n8n 2.30.1`\n- `n8n 2.29.8`","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":5406,"id":"CVE-2026-65591","ts":1788887280781,"field":"exploit_available","old":"false","new":"true"},{"seq":4289,"id":"CVE-2026-65591","ts":1788886394807,"field":"exploit_available","old":"true","new":"false"},{"seq":3038,"id":"CVE-2026-65591","ts":1788883058551,"field":"exploit_available","old":"false","new":"true"},{"seq":2067,"id":"CVE-2026-65591","ts":1788882463279,"field":"exploit_available","old":"true","new":"false"},{"seq":1140,"id":"CVE-2026-65591","ts":1788881899683,"field":"exploit_available","old":"false","new":"true"}]}