WP Fusion (Pro) <= 3.47.13 - Authenticated (Subscriber+) Privilege Escalation via ThriveCart Auto Login 'role' Parameter

The WP Fusion (Pro) plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 3.47.13. This is due to insufficient authorization checks on the role parameter in the ThriveCart Auto Login handler's thrivecart() function. This makes it possible for authenticated attackers, with Subscriber-level access and above, and who possess the access_key, to create a new user account with administrator privileges and gain full control over the WordPress site. The required access_key is intentionally shared with ThriveCart customers as part of the plugin's documented setup process, making it accessible to attackers who have made a purchase. The vulnerability is only exploitable when the ThriveCart Auto Login option is enabled.