FusionInvoice 2023-1.0 - Stored XSS (Cross-Site Scripting)

# Exploit Title: FusionInvoice 2023-1.0 - Stored XSS (Cross-Site Scripting)
# Date: 2023-05-24
# Exploit Author: Andrea Intilangelo
# Vendor Homepage: https://www.squarepiginteractive.com
# Software Link: https://www.fusioninvoice.com/store
# Version: 2023-1.0
# Tested on: Latest Version of Desktop Web Browsers (ATTOW: Firefox 113.0.1, Microsoft Edge 113.0.1774.50)
# CVE: CVE-2023-25439

Description:

A stored cross-site scripting (XSS) vulnerability in FusionInvoice 2023-1.0 (from Sqware Pig, LLC) allows attacker to
execute arbitrary web scripts or HTML.

Injecting persistent javascript code inside the title and/or description while creating a task/expense/project (and
possibly others) it will be triggered once page gets loaded.


Steps to reproduce:

- Click on "Expenses", or "Tasks" and add (or edit an existing) one,
- Insert a payload PoC inside a field, in example in the "Phone number" (or "Description"),
- Click on 'Save'.

Visiting the website dashboard, as well as the customer or project summary page, the javascript code will be executed.


PoC Screenshots:

https://imagebin.ca/v/7FOZfztkDs3I