In cybersecurity, theory of mind refers to the ability of artificial intelligence systems to model, infer, and anticipate the intentions, beliefs, or actions of other agents - such as humans, attackers, or defenders - within a shared environment. This capability enables systems to predict potential threats, understand adversarial behavior, and adapt security measures accordingly. By simulating the mental states of others, cybersecurity tools leveraging theory of mind can enhance threat detection, improve user authentication, and provide more robust defense mechanisms against social engineering or sophisticated attacks. This emerging approach aims to bring human-like reasoning and anticipation into automated security solutions.