The ACPT (Premium) plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.0.66. This is due to missing authorization in the `submit()` function, which allows unauthenticated form submissions to control the target user ID before calling `wp_update_user()`. This makes it possible for unauthenticated attackers to overwrite any WordPress user's email address and password, including an administrator's, and take over the account. Successful exploitation requires a public ACPT user form that permits anonymous submissions.

The ACPT (Premium) plugin for WordPress contains a critical privilege escalation vulnerability affecting all versions up to and including 2.0.66. The flaw exists in the submit() function, which lacks proper authorization checks, allowing unauthenticated attackers to submit forms and control the target user ID parameter. By manipulating this parameter before the wp_update_user() call, an attacker can overwrite any WordPress user's email address and password, including administrators. This effectively enables complete account takeover without any authentication. Exploitation requires that the targeted WordPress site has a public ACPT user form configured to allow anonymous submissions. The vulnerability is classified as a missing authorization issue and poses a critical risk to affected WordPress installations.