The wpForo Forum plugin for WordPress is vulnerable to arbitrary file read due to insufficient input validation in the 'update' method of the 'Members' class in all versions up to, and including, 2.4.1. This makes it possible for authenticated attackers, with subscriber-level privileges or higher, to read arbitrary files on the server.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.