Brainjacking refers to the unauthorized access, control, or manipulation of brain-computer interfaces (BCIs) or neural devices. As these technologies become more integrated into medical treatments and consumer applications, attackers may exploit vulnerabilities to intercept neural signals, alter device functions, or even influence a user's thoughts, actions, or sensory experiences. Brainjacking poses significant risks, including privacy violations, physical harm, and psychological manipulation. Protecting neural devices from such cyber threats requires robust security protocols, regular software updates, and careful device design to prevent exploitation. As BCIs advance, understanding and mitigating the risks of brainjacking is crucial for user safety and trust.