# Exploit Title: PHPJabbers Time Slots Booking Calendar v4.0 - HTML Injection  
# Date: 13/11/2023  
# Exploit Author: BugsBD Limited  
# Discover by: Rahad Chowdhury  
# Vendor Homepage:  
# Software Link:  
# Version: v4.0  
# Tested on: Windows 10, Windows 11, Linux  
# CVE-2023-48827  
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. "name, plugin_sms_api_key, plugin_sms_country_code, calendar_id,  
title, country name, customer_name" parameters are vulnerable to html  
3. Go to System Menu then click SMS Settings.  
4. Then use any HTML Tag in "SMS API Key", "Default Country Code"  
input field and Save.  
5. You will see HTML code working here.  
## Reproduce: