Cyber security is a rapidly developing field and open-source software (OSS) is being led by a collaborative community and a transparent nature. This research intends to make a theoretical framework highlighting the symbiosis of community engagement models, governance models, and the security of open-source ecosystems. The significant purposes aim to investigate how community engagement affects open source software development, analyze the deployment of the governance systems in widely used open source projects, and create the theoretical model that brings the cybersecurity processes in those practices. The literature survey covers existing research on open-source software development, community engagement, governance models, and cybersecurity practices within the OSS ecosystem. Through literature review the basic concepts are investigated using conceptual analysis to determine which principles and mechanisms the Community Model Engagement and Governance models operate, influencing the security of Open Source Software. Open-source project policy recommendations are the foundation for the security of communities where members fully contribute to better governance. This includes developing a fundamental conceptual analysis to lay out the framework's principles and operation (mechanisms). This contributes to the overall development of the theoretical framework. This research expects to develop a standardized theoretical framework that tackles the community engagement-governance models-security software link from new and insightful perspectives. Practical policy recommendations to protect OSS projects will be presented to solve the cybersecurity problem easily and immediately. This study aims to add to the academic and practical discussions that focus on human and organizational components' critical roles in securing open-source software. The discussion of theoretical aspects gives this platform a unique angle that fits well into the technical approach while improving the understanding of a legally open cybersecurity community