The 5 Knights of the MCP Apocalypse

Summary

The 5 Knights of the MCP Apocalypse 😱 December 09, 2025 4076 Unique Views 7 min read Share Let's talk about that new MCP (Model Context Protocol) Server your team is using to connect to your real data services. It's awesome, right? It's the "magic box" that gives your AI Agent access to the real world—live databases, internal APIs, and all your tools. But here's the catch: you don't own the code. 🚫 It's a vendor product, an open-source project, or another team's platform. You can't just change its code when you find a security hole, unless you have the code and recompile it and deploy it. This "black box" is now a central hub with the keys to your entire kingdom (or part of it). So, how do you protect your app's data when you can't trust the box itself? You have to become an auditor. Let's look at the five big risks and how to analyze and mitigate them. 1. The "My Prompt is Leaking Secrets" Problem 🔑 The Threat: A developer on your team is debugging. They paste this into their Agent-powered chat: "Why won't this connect? jdbc:mysql://prod-db... User: admin, Pass: SuperS3cretP@ssw0rd!" This prompt goes straight to the Agent, and it could be associated with an MCP server, it’s in the Agent’s world to decide if and which tools to use. Since you can't add a filter to block it, your real fear is: Is the MCP server logging this? If it is, you've just hardcoded a production secret into a log file, where it will live forever. What to do: Prevent pasting sensitive information in the assistant chat Work with local (on-premise) LLMs or have enterprise deals about confidentiality Analyze the MCP server code to check if they are logging all information sent Create a proxy for your Agent-MCP calls using PII/PHI redaction libraries like Philleas from Philterd Use guardrails tools like Lakera Guard that can help prevent (reducting) data leakage. 2. The "Is My Server a Double Agent?" Problem 🕵️ The Threat: The MCP server's job is to use your keys (e.g., a Jira API token, a database ...