Cross reality has redefined how individuals interact in the virtual and physical realms, offering a comprehensive paradigm for communication and collaboration. A rigorous examination of the literature from ACM, IEEE, SCOPUS, and ScienceDirect databases was conducted using a focused search string, resulting in the review of 42 relevant papers as of July 10th, 2023. Our analysis provides an understanding of the current state of cross reality collaboration across various fields, including hardware and software technology, applications, and hybrid user interfaces. Future research directions such as addressing non-adopters, implementing ‘Privacy by Design’ principles, and enhancing latency reduction are highlighted. We hope that our paper will serve as a stepping stone for researchers and practitioners aiming to develop novel cross reality collaboration experiences.