Creating Advanced Streamlined Electronic Services (CASES) for Constituents Act of 2017 This bill amends the Privacy Act of 1974 to require each executive agency to establish a system that allows an individual, or an entity authorized to act on such individual's behalf, to electronically submit a release form that grants another entity access to information in such system pertaining to the individual. The Office of Management and Budget shall establish a uniform release form to be used across agencies for such electronic submission.