Flowise CVE-2026-69263: Custom MCP server code execution bypass

critical severity · published 2026-08-04

An attacker who can control the package name in a Custom MCP server setup gets the earlier auto-install protection bypassed: npm's package runner fetches and runs the named package without asking. That means arbitrary code execution on the machine running Flowise.

Fixed in: 3.1.3

CVE: CVE-2026-69263

Source: NVD

Am I affected?

You are affected if the installed version is older than 3.1.3. Check the version you have and update to 3.1.3 or later. The fixed version is verified against a vendor or advisory source.

Get the fix

FixLane has a reviewed fix procedure for this incident: a read-only check first, then the fix. Ask the Telegram bot, or connect an AI agent to the FixLane MCP server and call get_fix_prompt with incident id 118 and your operating system.