How to Solve the Lethal Trifecta in AI Agents | Cyera Blog

This Cyera Research Labs report identifies the 'Lethal Trifecta'—the dangerous intersection of private-data access, untrusted-content consumption, and external-action capabilities in AI agents—that enables zero-click, language-based exfiltration of sensitive information. It documents an incident in which a customer service agent automatically sent 47 emails containing internal documents, explains why training and prompt engineering are insufficient defenses, and recommends four hard architectural boundaries (identity/permission scoping, runtime data-flow enforcement, isolation primitives, and human authorization gates) to prevent such attacks.