CVE-2026-40933

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 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: Improper Neutralization of Special Elements used in an OS Command

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...

Flowise operating system command injection vulnerability

Flowise is an open-source tool developed by FlowiseAI, designed for easily building LLM applications. Prior to Flowise 3.1.0, there was a vulnerability related to operating system command injection. This vulnerability stemmed from insecure serialization of printf commands in the MCP adapter,...

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...