Walk through any airport terminal, hospital corridor, or corporate lobby, and you will encounter digital signage displays. They announce flight departures, guide patients to their appointments, and broadcast company news to employees. These screens have become so common that we barely notice them anymore. And that invisibility is precisely the problem. While cybersecurity teams focus their attention on firewalls, endpoint protection, and cloud security, digital signage systems often slip under the radar as low-priority assets. Hackers, however, have taken notice.