CVE-2026-4473 in Online Doctor Appointment System
Summary
by MITRE • 03/20/2026
A vulnerability was detected in itsourcecode Online Doctor Appointment System 1.0. This issue affects some unknown processing of the file /admin/appointment_action.php. The manipulation of the argument appointment_id results in sql injection. The attack can be launched remotely. The exploit is now public and may be used.
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Analysis
by VulDB Data Team • 03/26/2026
The vulnerability identified as CVE-2026-4473 represents a critical sql injection flaw within the itsourcecode Online Doctor Appointment System version 1.0. This vulnerability specifically targets the administrative component of the application through the /admin/appointment_action.php file which processes user inputs without adequate validation or sanitization. The flaw occurs when the application receives the appointment_id parameter, which is then directly incorporated into sql query construction without proper input filtering mechanisms. This allows malicious actors to manipulate the sql query execution flow by injecting malicious sql commands through the appointment_id argument.
The technical nature of this vulnerability aligns with CWE-89 which categorizes sql injection as a direct consequence of insufficient input validation and improper parameter handling in database operations. The attack vector is particularly concerning as it enables remote exploitation, meaning that attackers can leverage this vulnerability from external networks without requiring physical access to the system. This remote attack capability significantly broadens the potential threat surface and increases the likelihood of successful exploitation. The fact that a public exploit is available further amplifies the risk, as it removes the need for sophisticated attack development and makes the vulnerability accessible to threat actors of varying skill levels.
The operational impact of this vulnerability extends beyond simple data theft, as it could potentially allow attackers to gain unauthorized access to sensitive patient information, modify appointment records, delete critical data, or even escalate privileges within the system. The online doctor appointment system likely contains confidential medical information and personal details of patients, making the potential data breach particularly severe from a privacy and compliance perspective. The vulnerability could also be exploited to disrupt healthcare services by manipulating appointment schedules or creating denial of service conditions within the administrative interface.
Mitigation strategies should prioritize immediate patching of the affected application version to address the sql injection vulnerability through proper input validation and parameterized query implementation. Organizations should implement web application firewalls to detect and block malicious sql injection attempts, while also applying the principle of least privilege to limit the database access rights of the application. The remediation process should include thorough code review to identify similar vulnerabilities in other components of the application, particularly any files handling user-supplied data. Additionally, regular security testing including automated vulnerability scanning and manual penetration testing should be implemented to proactively identify and address similar sql injection vulnerabilities throughout the application lifecycle. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application which emphasizes the importance of securing web applications and implementing proper input validation controls to prevent such exploitation vectors.