CVE-2026-40933 — AI Deep Analysis Summary

🚨 **Essence**: Flowise < 3.1.0 suffers from **OS Command Injection** via MCP stdio serialization.…

🛡️ **Root Cause**: **CWE-78** (OS Command Injection). The flaw lies in the **MCP Adapter**'s unsafe serialization of `stdio` commands, allowing malicious input to be executed as system commands.

🎯 **Affected**: **Flowise** versions **prior to 3.1.0**. Specifically targets the **MCP (Model Context Protocol) Adapter** component used for building LLM apps.

💀 **Impact**: High! CVSS is **Critical (9.8)**. Attackers gain **High Confidentiality, Integrity, and Availability** impact.…

🔑 **Threshold**: **Medium**. Requires **Authenticated Access** (PR:L). You must be logged in to add a malicious MCP stdio server. No UI interaction needed (UI:N), but network access (AV:N) is required.

📜 **Exploit Status**: No specific PoC code provided in data. However, references link to **Ox Security** advisories describing systemic RCE vulnerabilities in the MCP ecosystem, implying high risk of exploitation.

🔍 **Self-Check**: 1. Check Flowise version (< 3.1.0). 2. Review if **MCP Adapters** are enabled. 3. Audit user permissions to ensure only trusted users can configure MCP servers.…

✅ **Fix**: Yes. Upgrade to **Flowise 3.1.0** or later. The vendor has released a security advisory (GHSA-c9gw-hvqq-f33r) confirming the patch for the serialization flaw.

🚧 **No Patch?**: 1. **Disable MCP Adapters** if not strictly needed. 2. Restrict network access to Flowise. 3. Enforce strict **Authentication** and limit who can create/modify MCP server configurations.

⚡ **Urgency**: **CRITICAL**. With CVSS 9.8 and authenticated RCE potential, patch immediately. The MCP supply chain risk is systemic; do not delay upgrading to v3.1.0+.