On versions before 2.1.4, session is not invalidated after logout. When the user logged in successfully, the Backend service returns "Authorization" as the front-end authentication credential. "Authorization" can still initiate requests and access data even after logout. Mitigation: all users should upgrade to 2.1.4
https://lists.apache.org/thread/zslblrz1l0n9t67mqdv42yv75ncfn9zl