In modern education systems, digital technologies and online platforms play a significant role. In particular, Massive Open Online Courses (MOOCs) ensure globalization of education and provide open access to learning resources for a wide audience. Through these platforms, millions of users can study different subjects, technologies, and professional skills remotely. MOOC courses are also widely accessed through mobile devices. Among mobile devices, the most commonly used operating systems are iOS and Android. Therefore, ensuring the security of mobile operating systems in MOOC platforms is extremely important. This article analyzes the security mechanisms of iOS and Android operating systems used in mobile applications for MOOC platforms. In addition, issues related to protecting user data, authentication processes, data encryption, and security policies in mobile learning environments are discussed. The results of the study indicate that properly organized mobile operating system security can enhance the protection of user information, increase trust in MOOC systems, and improve the effectiveness of the learning process.