Online Marriage Registration System 1.0 - Persistent Cross-Site Scripting

Exploit Title: Online Marriage Registration System 1.0 - Persistent Cross-Site Scripting
# Google Dork: N/A
# Date: 2020-05-26
# Exploit Author: that faceless coder(Inveteck Global)
# Vendor Homepage: https://phpgurukul.com/
# Software Link: https://phpgurukul.com/online-marriage-registration-system-using-php-and-mysql/
# Version: Online Marriage Registration System 1.0 - Stored Cross-Site Scripting
# Tested on: MAC OS MOJAVE v 10.14.6
# CVE : N/A

The Online Marriage Registration System suffers from multiple stored cross-site script vulnerabilities: 

if(isset($_POST['submit']))
  {
  
$nofhusband=$_POST['nofhusband'];
$hreligion=$_POST['hreligion'];
$haddress=$_POST['haddress'];
$hstate=$_POST['hstate'];

$nofwife=$_POST['nofwife'];
$wreligion=$_POST['wreligion'];
$waddress=$_POST['waddress'];
$wstate=$_POST['wstate'];
$witnessnamef=$_POST['witnessnamef'];
$waddressfirst=$_POST['waddressfirst'];
$witnessnames=$_POST['witnessnames'];
$waddresssec=$_POST['waddresssec'];
$witnessnamet=$_POST['witnessnamet'];
$waddressthird=$_POST['waddressthird'];

$sql="insert into tblregistration(RegistrationNumber,UserID,DateofMarriage,HusbandName,HusImage,HusbandReligion,Husbanddob,HusbandSBM,HusbandAdd,HusbandZipcode,HusbandState,HusbandAdharno,WifeName,WifeImage,WifeReligion,Wifedob,WifeSBM,WifeAdd,WifeZipcode,WifeState,WifeAdharNo,WitnessNamefirst,WitnessAddressFirst,WitnessNamesec,WitnessAddresssec,WitnessNamethird,WitnessAddressthird)values(:regnumber,:uid,:dom,:nofhusband,:husimg,:hreligion,:hdob,:hsbmarriage,:haddress,:hzipcode,:hstate,:hadharno,:nofwife,:wifeimg,:wreligion,:wdob,:wsbmarriage,:waddress,:wzipcode,:wstate,:wadharno,:witnessnamef,:waddressfirst,:witnessnames,:waddresssec,:witnessnamet,:waddressthird)";
$query=$dbh->prepare($sql);

$sql="insert into tblregistration(RegistrationNumber,UserID,DateofMarriage,HusbandName,HusImage,HusbandReligion,Husbanddob,HusbandSBM,HusbandAdd,HusbandZipcode,HusbandState,HusbandAdharno,WifeName,WifeImage,WifeReligion,Wifedob,WifeSBM,WifeAdd,WifeZipcode,WifeState,WifeAdharNo,WitnessNamefirst,WitnessAddressFirst,WitnessNamesec,WitnessAddresssec,WitnessNamethird,WitnessAddressthird)values(:regnumber,:uid,:dom,:nofhusband,:husimg,:hreligion,:hdob,:hsbmarriage,:haddress,:hzipcode,:hstate,:hadharno,:nofwife,:wifeimg,:wreligion,:wdob,:wsbmarriage,:waddress,:wzipcode,:wstate,:wadharno,:witnessnamef,:waddressfirst,:witnessnames,:waddresssec,:witnessnamet,:waddressthird)";
$query=$dbh->prepare($sql);
$query->bindParam(':nofhusband',$nofhusband,PDO::PARAM_STR);
$query->bindParam(':hreligion',$hreligion,PDO::PARAM_STR);
$query->bindParam(':hdob',$hdob,PDO::PARAM_STR);
$query->bindParam(':hsbmarriage',$hsbmarriage,PDO::PARAM_STR);
$query->bindParam(':haddress',$haddress,PDO::PARAM_STR);
$query->bindParam(':hzipcode',$hzipcode,PDO::PARAM_STR);
$query->bindParam(':hstate',$hstate,PDO::PARAM_STR);
$query->bindParam(':hadharno',$hadharno,PDO::PARAM_STR);
$query->bindParam(':nofwife',$nofwife,PDO::PARAM_STR);
$query->bindParam(':wifeimg',$wifeimg,PDO::PARAM_STR);
$query->bindParam(':wreligion',$wreligion,PDO::PARAM_STR);
$query->bindParam(':wdob',$wdob,PDO::PARAM_STR);
$query->bindParam(':wsbmarriage',$wsbmarriage,PDO::PARAM_STR);
$query->bindParam(':waddress',$waddress,PDO::PARAM_STR);
$query->bindParam(':wzipcode',$wzipcode,PDO::PARAM_STR);
$query->bindParam(':wstate',$wstate,PDO::PARAM_STR);
$query->bindParam(':wadharno',$wadharno,PDO::PARAM_STR);
$query->bindParam(':witnessnamef',$witnessnamef,PDO::PARAM_STR);
$query->bindParam(':waddressfirst',$waddressfirst,PDO::PARAM_STR);
$query->bindParam(':witnessnames',$witnessnames,PDO::PARAM_STR);
$query->bindParam(':waddresssec',$waddresssec,PDO::PARAM_STR);
$query->bindParam(':witnessnamet',$witnessnamet,PDO::PARAM_STR);
$query->bindParam(':waddressthird',$waddressthird,PDO::PARAM_STR);
 $query->execute();

   $LastInsertId=$dbh->lastInsertId();
   if ($LastInsertId>0) {

echo '<script>alert("Registration form has been filled successfully.")</script>';
  }
  else
    {
         echo '<script>alert("Something Went Wrong. Please try again")</script>';
    }

The data gets stored through the mentioned vulnerable parameters into the database. There is no filtering when those values are printed when the web application fetches the data from the database