CVE-2026-91931 — Flowise before 3.1.4 Remote Code Execution via Custom MCP npx
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…
Published: 2026-09-15 · CVSS: 9.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7