Assumed Breach: The Evolution of Offensive Security Testing

**Executive Summary:** This TrustedSec post describes the Assumed Breach (AB) testing model as a scenario-based alternative to traditional penetration testing, explains how defenders and red teams have adapted to behavior-based detection and EDR, and details seven AB scenarios (SSO compromise, network pivot, endpoint compromise, perimeter compromise, DevOps, workstation compromise, and physical breach) including descriptions, minimum durations, and client requirements.