{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-58057", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-06-28T00:55:25.426Z", "datePublished": "2026-06-28T01:32:58.594Z", "dateUpdated": "2026-06-28T01:32:58.594Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-06-28T01:32:58.594Z"}, "datePublic": "2026-06-03T00:00:00.000Z", "title": "Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Handling of Case Sensitivity", "cweId": "CWE-178", "type": "CWE"}]}], "affected": [{"vendor": "Flowise", "product": "Flowise", "defaultStatus": "unaffected", "packageURL": "pkg:npm/flowise", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "3.1.3"}, {"version": "3.1.3", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.1.3"}]}]}], "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW", "baseScore": 5, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "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", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 2.3, "baseSeverity": "LOW"}}], "references": [{"url": "https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc", "name": "Proof of Concept", "tags": ["exploit", "third-party-advisory"]}, {"url": "https://github.com/FlowiseAI/Flowise/pull/6471", "name": "Fix (PR #6471, 3.1.3)", "tags": ["issue-tracking"]}, {"name": "VulnCheck Advisory: Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity"}], "credits": [{"lang": "en", "value": "ashdfrkl", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

{}

{}

{}