CVE-2025-7515 is a critical SQL Injection vulnerability identified in version 1.0 of the code-projects Online Appointment Booking System, specifically within the /ulocateus.php file. The vulnerability arises from improper sanitization or validation of the 'doctorname' parameter, which can be manipulated by an attacker to inject malicious SQL code. This injection flaw allows remote attackers to execute arbitrary SQL queries against the backend database without requiring authentication or user interaction. The vulnerability has been publicly disclosed, increasing the risk of exploitation, although no known exploits have been observed in the wild yet. The CVSS 4.0 base score is 6.9, indicating a medium severity level, with an attack vector that is network-based (remote), low attack complexity, no privileges or user interaction required, and limited impact on confidentiality, integrity, and availability. The vulnerability affects only version 1.0 of the product, which is an online system used for managing appointment bookings, likely storing sensitive user and appointment data. Exploitation could lead to unauthorized data access, data leakage, or potential modification of appointment records or user information, depending on the database schema and privileges of the application user.

For European organizations using the code-projects Online Appointment Booking System version 1.0, this vulnerability poses a significant risk to the confidentiality and integrity of sensitive personal and medical appointment data. Given the nature of appointment booking systems, the data involved may include personally identifiable information (PII) and possibly health-related data, which are subject to strict regulations such as the GDPR. Exploitation could result in unauthorized disclosure of patient or client information, leading to privacy violations, regulatory penalties, reputational damage, and potential operational disruption if the database integrity is compromised. Additionally, attackers could manipulate appointment data, causing service disruptions or fraud. Since the vulnerability can be exploited remotely without authentication, any exposed instance of the affected system on the internet is at risk. The medium CVSS score suggests that while the impact is serious, the overall damage might be limited by the scope of the affected system and the level of access the application has to the database. However, the public disclosure of the vulnerability increases the urgency for European organizations to address this issue promptly to prevent potential exploitation.

European organizations should immediately assess whether they are running version 1.0 of the code-projects Online Appointment Booking System and prioritize remediation. Since no official patch links are currently available, organizations should implement the following mitigations: 1) Apply input validation and parameterized queries or prepared statements to the 'doctorname' parameter in /ulocateus.php to prevent SQL injection. 2) Employ web application firewalls (WAFs) with rules specifically designed to detect and block SQL injection attempts targeting this parameter. 3) Restrict network exposure of the appointment booking system by limiting access to trusted IP ranges or placing the system behind VPNs or secure gateways. 4) Conduct thorough code reviews and penetration testing focused on SQL injection vectors in the application. 5) Monitor logs for suspicious SQL query patterns or unusual database activity. 6) Plan for an upgrade or patch deployment as soon as the vendor releases an official fix. 7) Implement database user privilege restrictions to minimize the impact of any successful injection, ensuring the application user has the least privileges necessary. These targeted actions go beyond generic advice and address the specific attack vector and context of this vulnerability.