Person-in-the-Middle (PitM)Person-in-the-Middle (PitM), also known as. Man-in-the-Middle (MitM), is a type of cyberattack where an attacker secretly intercepts and potentially alters communication between two parties who believe they are directly communicating with each other. In a PitM attack, the attacker is positioned between the sender and receiver and can intercept, modify, or manipulate th..