Cybersecurity experts must broaden their perspectives beyond traditional disciplinary boundaries to provide the best protection possible: they must practice transdisciplinary cybersecurity. Taking influence from the Stakeholder Theory in business ethics, this paper debuts a new framework for evaluating existing cybersecurity practices or postures, engaging with other disciplines to foster learning and create new methods, and encouraging new ways of thinking about, perceiving, and executing cybersecurity practices. Three use cases showcase applications of the framework in real-world scenarios. The ultimate goal of this paper is to encourage transdisciplinary thinking in cybersecurity and any other discipline. By using the tool presented here and developing their transdisciplinary thinking, experts can be better prepared to face the often unique and complex modern-day challenges.