CVE-2025-63513 identifies an Insecure Direct Object Reference (IDOR) vulnerability in the appointment cancellation feature of kishan0725 Hospital Management System version 4. IDOR vulnerabilities occur when an application exposes internal object references (such as database keys or file names) without proper authorization checks, allowing attackers to access or manipulate data belonging to other users. In this case, an authenticated user with limited privileges can cancel appointments that they are not authorized to cancel by manipulating the appointment identifier in the request. The vulnerability has a CVSS 3.1 base score of 6.5, indicating medium severity, with a vector of AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. This means the attack can be performed remotely over the network with low attack complexity, requires low privileges, no user interaction, and impacts confidentiality significantly but does not affect integrity or availability. The vulnerability is categorized under CWE-639 (Authorization Bypass Through User-Controlled Key). No patches or known exploits are currently available, but the risk remains due to the sensitive nature of healthcare appointment data. Exploitation could lead to unauthorized cancellation of patient appointments, potentially disrupting care and exposing patient scheduling information. The lack of integrity and availability impact suggests attackers cannot modify or delete data beyond cancellation or cause system downtime, but confidentiality breaches remain a concern. The vulnerability highlights insufficient access control enforcement in the appointment cancellation logic, a critical flaw in healthcare management systems where patient privacy and data protection are paramount.

For European organizations, especially healthcare providers using kishan0725 Hospital Management System or similar platforms, this vulnerability poses a risk to patient confidentiality and operational reliability. Unauthorized appointment cancellations could lead to patient care disruptions, loss of trust, and potential regulatory non-compliance with GDPR due to exposure or mishandling of personal health information. Although the vulnerability does not directly impact data integrity or system availability, the confidentiality breach alone is significant given the sensitivity of healthcare data. Attackers with low privileges could exploit this remotely without user interaction, increasing the risk of widespread abuse if the system is internet-facing or accessible within internal networks. The absence of known exploits provides a window for proactive mitigation, but the medium severity score underlines the need for timely remediation. European healthcare entities must consider the operational impact of appointment cancellations on patient treatment schedules and the reputational damage from privacy violations. This vulnerability also raises concerns about the overall robustness of access control mechanisms in healthcare IT systems, which are critical for compliance with stringent European data protection regulations.

To mitigate CVE-2025-63513, organizations should implement strict authorization checks on all appointment cancellation requests, ensuring users can only cancel appointments they are explicitly permitted to manage. This includes validating user identity and role against the appointment ownership or access rights before processing cancellation. Employing parameterized queries and avoiding direct exposure of internal object identifiers can reduce IDOR risks. Conduct thorough code reviews and penetration testing focused on access control enforcement in appointment management modules. Implement detailed logging and monitoring of cancellation activities to detect and respond to unauthorized attempts promptly. Segregate network access to the hospital management system, limiting exposure to trusted internal networks or VPNs. Educate staff on secure usage practices and promptly apply any vendor patches or updates once available. Additionally, consider implementing multi-factor authentication to reduce the risk of compromised credentials being used to exploit this vulnerability. Finally, review and update incident response plans to address potential appointment disruption scenarios.