CVE-2026-40933 Flowise: Authenticated RCE Via MCP Adapters

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, due to unsafe serialization of stdio commands in the MCP adapter, an authenticated attacker can add an MCP stdio server with an arbitrary command, achieving command execution. The vulnerabilit...

CVE-2026-40933

Flowise: Authenticated RCE via MCP adapters. Prior to 3.1.0, unsafe serialization of stdio commands in the MCP adapter allows an authenticated attacker to add an MCP stdio server and run arbitrary OS commands, due to a bug in input sanitization in the Custom MCP configuration (http://localhost:30...

GHSA-C9GW-HVQQ-F33R Flowise: Authenticated RCE Via MCP Adapters

Summary Due to unsafe serialization of stdio commands in the MCP adapter, an authenticated attacker can add an MCP stdio server with an arbitrary command, achieving command execution. Details The vulnerability lies in a bug in the input sanitization from the “Custom MCP” configuration in...