PHProjekt PhpSimplyGest v1.3. - Stored Cross-Site Scripting (XSS)

# Exploit Title: PHProjekt PhpSimplyGest v1.3.0 - Stored Cross-Site Scripting (XSS)
# Date: 2022-05-05
# Exploit Author: Andrea Intilangelo
# Vendor Homepage: http://www.phprojekt.altervista.org (removed demo was at http://phprojekt.altervista.org/phpsimplygest130)
# Software Link: https://github.com/robyfofo/MyProjects (original PhpSimplyGest https://github.com/robyfofo/PhpSimplyGest now merged/renamed into MyProjects)
# Version: 1.3
# Tested on: Latest Version of Desktop Web Browsers (ATTOW: Firefox 100.0, Microsoft Edge 101.0.1210.32)
# CVE: CVE-2022-27308

# Description:

A stored cross-site scripting (XSS) vulnerability in PHProjekt PhpSimplyGest v1.3.0 (and related products from same vendor,
like "MyProjects") allows attacker to execute arbitrary web scripts or HTML.

Injecting persistent javascript code inside the title description (or content) while creating a project, todo, timecard,
estimates, report or finding, it will be triggered once page gets loaded.

# Steps to reproduce:

Click on Projects and add or edit an existing one,

Insert the following PoC inside the Title

   <<SCRIPT>alert("XSS here");//\<</SCRIPT>

Click on 'Send'.

If a user visits the website dashboard, as well as project summary page, the javascript code will be rendered.