{"id":"CVE-2026-91931","title":"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","summary":"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 invok…","severity":"high","cvss":8.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-78"],"vendor":"FlowiseAI","product":"Flowise","affected":["Flowise < 3.1.4","Flowise < 3.1.4"],"published":"2026-09-15","updated":"2026-09-17","sourceUpdated":"2026-09-17T15:16:57.160","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91931","references":[{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vcwp-f9rq-3887","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/flowise-before-3.1.4-remote-code-execution-via-custom-mcp-npx","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vcwp-f9rq-3887","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-17T14:49:25.987658Z"},"epss":0.00629,"epssPercentile":0.48468,"ingestedAt":"2026-09-15T15:39:12.925Z","slug":"CVE-2026-91931","body":"## Overview\n\nFlowise 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":59,"depthScoreParts":{"impact":46.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":206149,"id":"CVE-2026-91931","ts":1789658475816,"field":"exploit_available","old":"false","new":"true"}]}