The WP STAGING Pro WordPress Backup Plugin plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 5.6.0. This is due to missing or incorrect nonce validation on the 'sub' parameter called from the WP STAGING WordPress Backup Plugin - Backup Duplicator & Migration plugin. This makes it possible for unauthenticated attackers to include any local files that end in '-settings.php' via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

The WP STAGING WordPress Backup plugin before 3.2.0 allows access to cache files during the cloning process which provides

The WP STAGING WordPress Backup Plugin before 3.1.3 and WP STAGING Pro WordPress Backup Plugin before 5.1.3 do not prevent visitors from leaking key information about ongoing backups processes, allowing unauthenticated attackers to download said backups later.

The WP STAGING WordPress plugin before 2.9.18 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)