{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-91931", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-15T11:06:02.263Z", "datePublished": "2026-09-15T15:17:55.607Z", "dateUpdated": "2026-09-15T15:17:55.607Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-15T15:17:55.607Z" }, "datePublic": "2026-08-31T00:00:00.000Z", "title": "Flowise before 3.1.4 Remote Code Execution via Custom MCP npx", "descriptions": [ { "lang": "en", "value": "Flowise before 3.1.4 contains a remote code execution vulnerability in the Custom MCP node that allows authenticated attackers to execute arbitrary code by supplying npx package names in the mcpServerConfig parameter. Attackers can invoke npx with attacker-controlled npm packages to execute code on the Flowise server." } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "description": "Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "cweId": "CWE-78", "type": "CWE" } ] } ], "affected": [ { "vendor": "FlowiseAI", "product": "Flowise", "defaultStatus": "unaffected", "packageURL": "pkg:npm/flowise", "versions": [ { "version": "0", "status": "affected", "versionType": "semver", "lessThan": "3.1.4" }, { "version": "3.1.4", "status": "unaffected", "versionType": "semver" } ] }, { "vendor": "FlowiseAI", "product": "Flowise", "defaultStatus": "unaffected", "packageURL": "pkg:npm/flowise-components", "versions": [ { "version": "0", "status": "affected", "versionType": "semver", "lessThan": "3.1.4" }, { "version": "3.1.4", "status": "unaffected", "versionType": "semver" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.1.4" } ] } ] }, { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.1.4" } ] } ] } ], "metrics": [ { "format": "CVSS", "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 8.5, "baseSeverity": "HIGH" } }, { "format": "CVSS", "cvssV4_0": { "version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H", "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "baseScore": 9, "baseSeverity": "CRITICAL" } } ], "references": [ { "url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vcwp-f9rq-3887", "tags": [ "vendor-advisory" ], "name": "GitHub Security Advisory (GHSA-vcwp-f9rq-3887)" }, { "name": "VulnCheck Advisory: Flowise before 3.1.4 Remote Code Execution via Custom MCP npx", "tags": [ "third-party-advisory" ], "url": "https://www.vulncheck.com/advisories/flowise-before-3.1.4-remote-code-execution-via-custom-mcp-npx" } ], "credits": [ { "lang": "en", "value": "DavidCarliez", "type": "reporter" } ], "x_generator": { "engine": "vulncheck-endgame" } } } }