WooCommerce Modal Fly Cart + Ajax add to cart - Reflected cross-site scripting (XSS)

 129 | )
 130 | );
 131 |
 132 |
 133 | }
 134 |
 135 |
 136 |
 137 | public function so_27270880_add_variation_to_cart() {
 138 |
> 139 |    echo $_POST['product_id'];
  140 |    exit ;
  141 |    ob_start();
  142 |
  143 |    $product_id        = apply_filters( 'woocommerce_add_to_cart_product_id', absint( $_POST['product_id'] ) );
  144 |    $quantity          = empty( $_POST['quantity'] ) ? 1 : wc_stock_amount( $_POST['quantity'] );
  145 |
  146 |    $variation_id      = isset( $_POST['variation_id'] ) ? absint( $_POST['variation_id'] ) : '';
  147 |    $variations         = ! empty( $_POST['variation'] ) ? (array) $_POST['variation'] : '';
  148 |
  149 |    $passed_validation = apply_filters( 'woocommerce_add_to_cart_validation', true, $product_id, $quantity, $variation_id,
      ^ Col 0