MCP agents exfiltrate secrets via toxic permission chains

AI agents using the Model Context Protocol can exfiltrate sensitive data through toxic agent flows by combining individually permitted steps into an unintended data-exfiltration path. Security experts note that because each step is authorized and looks like normal work, traditional security scanners miss the multi-step sequence. Recommended defenses include reviewing permission combinations, isolating sensitive read and write identities, adding approval gates for actions that move data, and testing agents with adversarial scenarios. Open article →