There isn't a specific "pass" score on the LSAT for admission to UMKC School of Law. UMKC, like most law schools, doesn't have a cutoff score. Instead, they consider the LSAT score as one factor among many in their holistic review process. A higher LSAT score significantly improves your chances of admission, but a lower score doesn't automatically disqualify you.
To get a sense of the competitiveness, look at UMKC's median LSAT score for recently admitted classes. This will give you a better idea of the range of scores of successful applicants. You can usually find this information on the UMKC School of Law website or through US News & World Report's law school rankings.