The MainWP Child plugin for WordPress allows users to manage multiple sites through a dashboard. However, there is a security flaw in versions up to 5.2. This flaw allows unauthorized individuals to gain administrator access to sites that have not yet been connected to the MainWP Dashboard. It is important to note that this only affects sites with the MainWP Child plugin installed and not yet connected to the dashboard, and do not have the unique security ID feature enabled. If your site is already connected to the dashboard or has the security ID feature enabled, you do not need to upgrade. Please be aware that version 5.2.1 has a partial fix, but version 5.3 is the complete fix.