Input validation vulnerability in WPFront User Role Editor 4.2.1

A plugin called WPFront User Role Editor, used on WordPress websites, has a security issue that could allow hackers to gain access to sensitive information. This vulnerability exists in all versions of the plugin up to version 4.2.1. The problem is caused by a missing or incorrect security check, which means that attackers could potentially change the default user role on a website and gain more privileges. This could happen if they trick a site administrator into clicking on a harmful link. This issue only affects websites with multiple sites, known as multisite instances.