Require CSRF token to edit more admin settings - thanks again to @stehled

settings_tax_add_modal.php

@@ -8,6 +8,8 @@
         </button>
       </div>
       <form action="post.php" method="post" autocomplete="off">
+        <input type="hidden" name="csrf_token" value="<?php echo $_SESSION['csrf_token'] ?>">
+
         <div class="modal-body bg-white">
           <div class="form-group">
             <label>Name <strong class="text-danger">*</strong></label>
@@ -25,4 +27,4 @@
       </form>
     </div>
   </div>
-</div>
+</div>