Comments Like Dislike < 1.1.4 - Add Like/Dislike Bypass
The plugin allows users to like/dislike posted comments, however does not prevent them from replaying the AJAX request to add a like. This allows any user (even unauthenticated) to add unlimited like/dislike to any comment. The plugin appears to have some Restriction modes, such as Cookie Restriction, IP Restrictions, Logged In User Restriction, however, they do not prevent such attack as they only check client side
v1.1.3 fixed the issue for the Logged In User Restriction mode, but not the others. v1.1.4 fixed it for the remaining affected modes.
Proof of Concept
Capture the request made when adding a like to a comment, and replay the request
POST /wp-admin/admin-ajax.php HTTP/1.1
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8