Your Most Dangerous User Is Not Human: How AI Agents and MCP Servers Broke the Internal API Walled Garden
Last month, Microsoft quietly confirmed something that should keep every CISO up at night. As first reported by BleepingComputer and later detailed by TechCrunch, a bug in Microsoft Office allowed Copilot, the AI assistant embedded in millions of enterprise environments, to summarize confidential emails and hand them to users who had no business seeing them. Sensitivity labels? Ignored. Data loss prevention (DLP) policies? Bypassed entirely. This wasn't the work of a hacker or malware.