PHPJabbers Appointment Scheduler 3.0 HTML Injection

`# Exploit Title: PHPJabbers Appointment Scheduler v3.0 - Multiple HTML Injection  
# Date: 19/11/2023  
# Exploit Author: BugsBD Limited  
# Discover by: Rahad Chowdhury  
# Vendor Homepage: https://www.phpjabbers.com/  
# Software Link: https://www.phpjabbers.com/appointment-scheduler/  
# Version: v3.0  
# Tested on: Windows 10, Windows 11, Linux  
# CVE-2023-48838  
  
Descriptions:  
PHPJabbers Appointment Scheduler v3.0 is vulnerable to Multiple HTML  
Injection. HTML injection, also known as HTML code injection or  
cross-site scripting (XSS), is a web security vulnerability that  
allows an attacker to inject malicious code into a web page that is  
then viewed by other users. This can lead to various attacks, such as  
stealing sensitive information, session hijacking, defacement of  
websites, or delivering malware to users.  
  
Steps to Reproduce:  
1. Login your panel.  
2. Go to System Menu then click SMS Settings.  
3. Then use any HTML Tag in "SMS API Key", "Default Country Code"  
input field and Save.  
4. You will see HTML code working here.  
  
  
## Reproduce:  
[href](https://github.com/bugsbd/CVE/tree/main/2023/CVE-2023-48838)  
`