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

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 vulnerability lies in a bug in the input sanitization from the “Custom MCP” configuration in http://localhost:3000/canvas - where any user can add a new MCP, when doing so - adding a new MCP using stdio, the user can add any command, even though your code have input sanitization checks such as validateCommandInjection and validateArgsForLocalFileAccess, and a list of predefined specific safe commands - these commands, for example "npx" can be combined with code execution arguments ("-c touch /tmp/pwn") that enable direct code execution on the underlying OS. This vulnerability is fixed in 3.1.0.

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

OS命令中使用的特殊元素转义处理不恰当(OS命令注入)

Flowise 操作系统命令注入漏洞

Flowise是FlowiseAI开源的一个用于轻松构建 LLM 应用程序的工具。 Flowise 3.1.0之前版本存在操作系统命令注入漏洞，该漏洞源于MCP适配器中对stdio命令的不安全序列化，可能导致经过身份验证的攻击者添加带有任意命令的MCP stdio服务器，实现命令执行。

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