CVE-2026-91931
Medium
Elevated severity or exploit probability.
CVSS base
8.5
HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
0.7%
50.1th percentile
CISA KEV
Not listed
Weakness / dates
CWE-78
Published 2026-09-15 · modified 2026-09-23
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.