W3 Total Cache < 2.10.0 - Unauthenticated Arbitrary File Read via f_array[] Parameter

Description

The plugin is vulnerable to Directory Traversal via the setupSources function, allowing unauthenticated attackers to read the contents of arbitrary files on the server, which can contain sensitive information. Exploitation requires enabling manual minify mode and supplying a manual-format minify filename so that the hash is empty and the f_array[] entries are not overwritten before reaching setupSources().