Input validation vulnerability in MaxSlider 1.2.3

The MaxSlider plugin for WordPress has a security issue that affects all versions up to 1.2.3. This vulnerability allows attackers who have Contributor-level access or higher to access and run any files on the server. This means they can run any code written in those files, which can lead to bypassing security measures, accessing private information, or executing code. This can happen even if the files are usually considered safe, such as images or similar types of files.