The general computer direction requires students to master software skills. It is difficult to apply for a master's degree across majors. If your undergraduate major is mathematics, minor in cs or double degree, and have relevant study accumulation, it is ok to apply for a master's degree in computer science. Generally speaking, science and engineering majors should have relevant academic background.
It is difficult to apply for a doctorate in finance, but it still depends on which direction to apply, financial engineering or traditional finance doctorate. However, as such a career-oriented discipline, most students are required to work directly in the industry after graduation from undergraduate or master's degree, especially finance, which does not require a large number of academic talents, but is more of a practitioner's major. Therefore, many schools, especially the top 100 schools, need 0-3 PhDs in the financial field every year, and quite a few schools do not recruit a Ph.D. in the financial field for several years. Moreover, many doctors in this major want to deepen themselves or stay in school to teach after many years of practice.
No matter which major you are, you need to have a strong academic accumulation in related disciplines, so that the application is feasible. Of course, the focus is on the process of accumulation and whether you can contact a matching professor to accept it in the future, and there is a clear research direction to connect with the professor.