BetterDocs Pro < 3.8.1 - Unauthenticated Local File Inclusion via doc_style

Description

The plugin is vulnerable to Local File Inclusion via the `doc_style` parameter. This makes it possible for unauthenticated attackers to include and execute arbitrary .php files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where .php file types can be uploaded and included.