CVE-2026-3724: Pamzey Queue Management Auth Bypass Flaw

CVE-2026-3724 Overview

A weakness has been identified in SourceCodester Patients Waiting Area Queue Management System 1.0. This impacts an unknown function of the file /checkin.php. This manipulation of the argument patient_id causes improper authorization. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks.

Critical Impact

Attackers can exploit improper authorization controls in the patient check-in functionality, potentially allowing unauthorized access to patient queue data or manipulation of check-in records through the patient_id parameter.

Affected Products

• Pamzey Patients Waiting Area Queue Management System 1.0

Discovery Timeline

• 2026-03-08 - CVE CVE-2026-3724 published to NVD
• 2026-03-09 - Last updated in NVD database

Technical Details for CVE-2026-3724

Vulnerability Analysis

This vulnerability represents an improper authorization flaw (CWE-266: Incorrect Privilege Assignment) in the Patients Waiting Area Queue Management System. The vulnerability exists in the /checkin.php file, where the patient_id parameter is not properly validated for authorization before processing. This allows an authenticated attacker to potentially manipulate or access patient queue information belonging to other users.

The vulnerability is network-accessible, meaning remote attackers can exploit it without requiring physical access to the target system. The attack complexity is low, and exploitation requires only low-level privileges, making this vulnerability relatively easy to exploit once an attacker has basic access to the system.

Root Cause

The root cause of this vulnerability is insufficient authorization checks on the patient_id parameter within the /checkin.php endpoint. The application fails to verify whether the authenticated user has legitimate access rights to the specified patient record before performing check-in operations. This is a classic example of Insecure Direct Object Reference (IDOR), where user-supplied input is used to directly access database objects without proper authorization validation.

Attack Vector

The attack vector is network-based, allowing remote exploitation. An attacker with low-level privileges can manipulate the patient_id parameter in requests to /checkin.php to access or modify patient queue records they are not authorized to interact with. This could allow horizontal privilege escalation, where an attacker accesses data belonging to other patients in the queue management system.

The vulnerability can be exploited by submitting crafted HTTP requests to the /checkin.php endpoint with arbitrary patient_id values. Since the application does not properly verify authorization, the attacker can enumerate and access patient records by iterating through patient ID values.

Detection Methods for CVE-2026-3724

Indicators of Compromise

• Unusual access patterns to /checkin.php with sequential or enumerated patient_id values
• Multiple requests to the check-in endpoint from a single session with different patient IDs
• Access log entries showing attempts to access patient records outside normal operational hours
• Failed or successful requests with patient_id values that don't belong to the authenticated user

Detection Strategies

• Implement web application firewall (WAF) rules to detect parameter enumeration attempts on the patient_id field
• Monitor application logs for anomalous access patterns to the /checkin.php endpoint
• Deploy intrusion detection systems (IDS) with signatures for IDOR attack patterns
• Enable detailed logging of all authorization failures and access attempts

Monitoring Recommendations

• Configure real-time alerting for suspicious parameter manipulation in check-in requests
• Establish baseline access patterns and alert on deviations indicating potential exploitation
• Implement session monitoring to detect unusual numbers of patient record accesses per session
• Review audit logs regularly for evidence of unauthorized patient data access

How to Mitigate CVE-2026-3724

Immediate Actions Required

• Review and restrict access to the /checkin.php endpoint until a patch is available
• Implement additional server-side authorization checks to validate patient_id ownership
• Enable detailed logging for the affected endpoint to detect exploitation attempts
• Consider temporarily disabling the check-in functionality if the risk is deemed too high

Patch Information

As of the last update on 2026-03-09, no official patch has been released by the vendor. Organizations using this software should monitor the SourceCodester Code Repository for security updates. Additional technical information is available through VulDB #349700 and the GitHub Project Overview.

Workarounds

• Implement server-side authorization validation to ensure users can only access their own patient records
• Add session-based validation to verify the patient_id belongs to the authenticated user before processing
• Deploy a web application firewall with rules to block parameter tampering attempts
• Restrict network access to the application to trusted IP ranges where possible

# Configuration example - Apache .htaccess restriction for checkin.php
<Files "checkin.php">
    # Restrict access to internal network only as temporary mitigation
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
    
    # Enable additional logging for forensic purposes
    SetEnvIf Request_URI "checkin\.php" log_checkin
    CustomLog /var/log/apache2/checkin_access.log combined env=log_checkin
</Files>