WooCommerce Customers Manager <= 31.3 - Missing Authorization to Authenticated (Subscriber+) Privilege Escalation

The WooCommerce Customers Manager plugin for WordPress is vulnerable to Privilege Escalation due to a missing capability check on the ajax_assign_new_roles() function in all versions up to, and including, 31.3. This makes it possible for authenticated attackers, with Subscriber-level access and above, to elevate their privileges to that of an administrator.