{"id":"CVE-2026-58057","aliases":[],"cve":{"records":[{"id":"CVE-2026-58057","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-06-28T00:55:25.426Z","published":"2026-06-28T01:32:58.594Z","modified":"2026-11-08T14:06:43.889Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-11-08T14:06:43.889Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-06-29T12:25:16.778Z"}],"references":[{"url":"https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc","tags":["exploit","third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/FlowiseAI/Flowise/pull/6471","tags":["issue-tracking","patch"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-178","description":"Improper Handling of Case Sensitivity","source":"VulnCheck"}],"applicability":[{"source":"VulnCheck","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*","versionEndExcluding":"3.1.3"}]}]}]}],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-06-29T12:23:43.023783Z","decisions":[{"name":"Exploitation","value":"poc"},{"name":"Automatable","value":"no"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'node_options' bypasses the NODE_OPTIONS denylist entry. An authenticated user who can configure a Custom MCP node can thereby inject NODE_OPTIONS --require and execute arbitrary code in the Flowise server context.","score":5,"severity":"medium","published":"2026-06-28T01:32:58.594Z","modified":"2026-11-08T14:06:43.889Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Flowise","name":"Flowise","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"3.1.3","versionType":"semver"},{"version":"3.1.3","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:npm/flowise","packageIdentity":{"ecosystem":"npm","name":"flowise"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-58057"}],"remediation":[],"references":["https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc","https://github.com/FlowiseAI/Flowise/pull/6471","https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity"],"sources":[{"name":"CVE","id":"CVE-2026-58057","modified":"2026-11-08T14:06:43.889Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-58057"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","score":5},{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","score":2.3}],"sourceAffected":[],"observedAt":"2026-11-08T14:27:03.985Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T03:20:35.359Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-08T21:25:35.039Z","attemptedAt":"2026-11-08T21:25:35.039Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-08T21:25:35.387Z","attemptedAt":"2026-11-08T21:25:35.387Z"},{"source":"EUVD","status":"refresh-failed","attemptedAt":"2026-11-08T21:25:33.978Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-08T21:25:35.011Z","attemptedAt":"2026-11-08T21:25:35.011Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-58057","url":"https://www.first.org/epss/","probability":0.01556,"percentile":0.75351,"date":"2026-11-08","checkedAt":"2026-11-08T21:25:35.011Z"},{"source":"NVD","id":"CVE-2026-58057","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58057","modified":"2026-10-25T17:10:00.197","score":2.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-11-08T21:25:35.039Z"},{"source":"NVD","id":"CVE-2026-58057","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58057","modified":"2026-10-25T17:10:00.197","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","checkedAt":"2026-11-08T21:25:35.039Z"},{"source":"GitHub Advisory Database","id":"GHSA-rqqr-m697-6jq3","url":"https://github.com/advisories/GHSA-rqqr-m697-6jq3","modified":"2026-06-28T03:33:41Z","score":5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","checkedAt":"2026-11-08T21:25:35.387Z"},{"source":"Exploit-DB","id":"52623","url":"https://www.exploit-db.com/exploits/52623","checkedAt":"2026-11-15T00:00:37.813Z"}],"aiSummary":{"text":"Flowise before version 3.1.3 has a vulnerability where an authenticated user can bypass the NODE_OPTIONS denylist by using case sensitivity, potentially executing arbitrary code. The weakness is due to improper handling of case sensitivity. An attacker needs access to configure a Custom MCP node.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-11-08T15:26:05.371Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-58057"}]}}