CVE-2026-91931

HIGHCVSS 8.5

Description

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.

Timeline

Published:September 15th, 2026 4:17 PM

Last modified:September 23rd, 2026 5:17 PM

CVSS Scoring

CVSS v3: 8.5 (HIGH)

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

CWE-78

References & Reports

Advisories, patches, and third-party reports

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vcwp-f9rq-3887
https://www.vulncheck.com/advisories/flowise-before-3.1.4-remote-code-execution-via-custom-mcp-npx
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vcwp-f9rq-3887

Source: NIST NVD · Data may lag official sources by up to one minute