The WP Photo Album Plus WordPress plugin before 9.2.09.002 does not check that the current user is allowed to upload into the album they target when it processes a front-end upload, allowing any authenticated user, such as a Subscriber, to upload files into albums owned by other users or by the administrator. Exploitation requires the WP Photo Album Plus WordPress plugin before 9.2.09.002's front-end user upload feature to be enabled, which is not the default.