CVE-2025-7515 is a critical SQL Injection vulnerability identified in version 1.0 of the code-projects Online Appointment Booking System. The vulnerability exists in the /ulocateus.php file, specifically through the manipulation of the 'doctorname' parameter. An attacker can remotely exploit this flaw without requiring authentication or user interaction, by injecting malicious SQL code into the 'doctorname' argument. This injection can lead to unauthorized access to the backend database, potentially allowing attackers to extract sensitive patient or appointment data, modify or delete records, or escalate privileges within the system. The vulnerability has been publicly disclosed, increasing the risk of exploitation, although no known exploits are currently reported in the wild. The CVSS 4.0 base score is 6.9, indicating a medium severity level, with the vector highlighting network attack vector, low attack complexity, no privileges or user interaction required, and low impact on confidentiality, integrity, and availability. Despite the medium CVSS rating, the nature of SQL injection vulnerabilities and the sensitive context of appointment booking systems warrant careful attention.

For European organizations using the affected Online Appointment Booking System version 1.0, this vulnerability poses significant risks. Exploitation could lead to unauthorized disclosure of personal data, including patient identities, appointment details, and possibly medical information, violating GDPR and other data protection regulations. This could result in legal penalties, reputational damage, and loss of customer trust. Additionally, attackers could manipulate booking data, causing operational disruptions or denial of service to legitimate users. Healthcare providers and clinics relying on this system may face service interruptions, impacting patient care. The ability to exploit remotely without authentication increases the threat level, especially for organizations with internet-facing booking portals. Given the sensitivity of healthcare data and strict European privacy laws, the impact extends beyond technical damage to regulatory and compliance consequences.

To mitigate this vulnerability, organizations should first verify if they are running version 1.0 of the code-projects Online Appointment Booking System. Immediate steps include: 1) Applying any available patches or updates from the vendor; if no official patch exists, consider upgrading to a newer, secure version or replacing the system. 2) Implementing Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting the 'doctorname' parameter. 3) Conducting input validation and sanitization on all user-supplied data, especially parameters used in SQL queries, employing parameterized queries or prepared statements to prevent injection. 4) Restricting database user permissions to the minimum necessary to limit the impact of any successful injection. 5) Monitoring logs for suspicious activity related to the vulnerable endpoint. 6) If immediate patching is not possible, consider temporarily disabling or restricting access to the vulnerable functionality. 7) Educating IT staff about the vulnerability and ensuring incident response plans are updated to handle potential exploitation.