wger is a free, open-source workout and fitness manager. Prior to version 2.6, five gym management views in wger apply a flawed gym-scope guard ("gym_a != gym_b") that silently passes when both operands are "None". A trainer with "gym.gym_trainer" and "gym.add_adminusernote" permissions and no gym assignment ("gym=None") can read private admin notes, uploaded documents, gym contracts, user configuration, and user permission data for any other unaffiliated user on the instance. The subsequent querysets filter only on the attacker-supplied "member_id" with no secondary gym-scoped validation, so all records are disclosed. Version 2.6 fixes the issue.