CVE-2026-85402 in Doctor Appointment System
Summary
by MITRE • 09/04/2026
A vulnerability was detected in code-projects Doctor Appointment System 1.0. This vulnerability affects unknown code of the file /patient/booking.php. The manipulation of the argument doc_id results in sql injection. The attack may be launched remotely. The exploit is now public and may be used.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 09/04/2026
The discovery of a critical security flaw within the Doctor Appointment System version 1.0 highlights significant deficiencies in input validation and query construction practices commonly found in legacy or poorly maintained web applications. Specifically, the vulnerability resides in the patient booking module, targeting the file path /patient/booking.php. This component is responsible for handling user requests to schedule medical appointments, a function that inherently requires interaction with a backend database to store appointment details such as date, time, and provider information. The core issue lies in how the application processes the doc_id argument passed by the client during these booking operations. Instead of treating this input as a simple identifier or parameter value, the system incorporates it directly into SQL queries without adequate sanitization or parameterization. This architectural oversight creates an opportunity for attackers to inject malicious SQL code, fundamentally altering the intended logic of database interactions and compromising data integrity.
This vulnerability is classified under Common Weakness Enumeration (CWE) as CWE-89, which denotes Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. The technical mechanism involves the attacker manipulating the doc_id parameter to include syntactically valid SQL statements that terminate the original query and append new commands. For instance, by appending a sequence such as ' OR 1=1 -- or utilizing UNION-based techniques, an adversary can bypass authentication checks, extract sensitive data from other tables within the database schema, modify existing records, or even execute administrative operations depending on the privileges of the database user account associated with the web application. The presence of this flaw indicates that the developer likely used string concatenation to build SQL queries rather than employing prepared statements or stored procedures, which are industry-standard defenses against such injection attacks.
From an operational perspective, the impact of this vulnerability is severe due to its remote exploitability and public availability. Because the attack vector is network-based, a malicious actor does not need physical access to the server or local system privileges to initiate exploitation. They can launch attacks from any location with internet connectivity by sending crafted HTTP requests to the targeted endpoint. The fact that an exploit for this specific vulnerability is now publicly available significantly lowers the barrier to entry for attackers, including those with limited technical expertise who may utilize automated scanning tools and pre-written scripts found on public repositories or dark web forums. This increases the likelihood of successful compromise, particularly in environments where patching cycles are slow or security monitoring is insufficient. Successful exploitation could lead to unauthorized access to patient records, exposure of personally identifiable information (PII), violation of healthcare privacy regulations such as HIPAA or GDPR, and potential disruption of medical services if critical data is corrupted or deleted.
To mitigate this vulnerability, immediate remediation steps must be taken by the system administrators and developers responsible for maintaining the Doctor Appointment System. The primary corrective action involves refactoring the code in /patient/booking.php to use parameterized queries or prepared statements provided by the underlying database driver. This ensures that user-supplied input is treated strictly as data rather than executable code, effectively neutralizing injection attempts regardless of their content. Additionally, implementing strict input validation on all parameters, including doc_id, can provide a secondary layer of defense by rejecting requests containing unexpected characters or formats. Beyond immediate patching, organizations should conduct a comprehensive security audit to identify similar vulnerabilities across other modules that interact with the database. Deploying a Web Application Firewall (WAF) configured with rules specific to SQL injection patterns can also help detect and block malicious traffic in real-time while permanent fixes are implemented. Regular penetration testing and code reviews focused on secure coding standards, such as those outlined by OWASP, are essential for preventing future occurrences of this class of vulnerability.