This vulnerability in itsourcecode Hospital Management System 1.0 involves a cross-site scripting issue due to insufficient sanitization of the patientid argument in the /billing.php endpoint. An attacker can remotely supply crafted input to execute arbitrary scripts in the context of the affected application. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, and low impact on integrity and availability. No official fix or patch has been documented as of the publication date.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the victim's browser when interacting with the affected system. This may lead to session hijacking, defacement, or other client-side impacts. The vulnerability does not directly affect system integrity or availability based on the CVSS vector. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider applying input validation or sanitization controls on the patientid parameter at the application or web server level. Monitoring for suspicious input patterns may help detect exploitation attempts. Avoid relying solely on client-side mitigations.