CVE-2025-7764 is a critical SQL Injection vulnerability identified in version 1.0 of the code-projects Online Appointment Booking System, specifically within the /admin/deletedoctorclinic.php file. The vulnerability arises from improper sanitization or validation of the 'clinic' parameter, which is manipulated to inject malicious SQL code. This flaw allows an unauthenticated remote attacker to execute arbitrary SQL commands against the backend database without requiring any user interaction or privileges. The vulnerability is exploitable over the network (AV:N), with low attack complexity (AC:L), no authentication required (PR:N), and no user interaction needed (UI:N). The impact vector includes limited confidentiality, integrity, and availability impacts (VC:L, VI:L, VA:L), indicating that the attacker can potentially read, modify, or delete data but with some constraints. The vulnerability does not affect system confidentiality, integrity, or availability on a systemic scale (SC:N, SI:N, SA:N). The exploit has been publicly disclosed, increasing the risk of exploitation, although no known exploits are currently observed in the wild. The CVSS v4.0 score is 6.9, categorized as medium severity. The vulnerability's presence in an administrative script suggests that it targets backend management functionality, which could allow attackers to manipulate sensitive appointment or clinic data, potentially disrupting healthcare service operations or exposing patient information. Given the nature of appointment booking systems, which often handle personal and scheduling data, exploitation could lead to unauthorized data disclosure, data tampering, or denial of service through database corruption or deletion.

For European organizations, particularly healthcare providers, clinics, and hospitals using the code-projects Online Appointment Booking System version 1.0, this vulnerability poses a significant risk. Exploitation could lead to unauthorized access to sensitive patient appointment data, manipulation or deletion of clinic schedules, and potential disruption of healthcare services. This could result in operational downtime, loss of patient trust, regulatory non-compliance (e.g., GDPR violations due to data breaches), and financial penalties. The ability to remotely exploit the vulnerability without authentication increases the attack surface, making it easier for threat actors to target vulnerable systems. Additionally, since appointment systems often integrate with other healthcare IT infrastructure, a successful attack could serve as a pivot point for broader network compromise. The public disclosure of the exploit details further elevates the threat level, as it enables attackers to develop and deploy automated attack tools rapidly. European healthcare entities are particularly sensitive to such disruptions due to stringent data protection laws and the critical nature of healthcare services.

1. Immediate patching or upgrading: Organizations should check for any available patches or updates from the vendor and apply them promptly. If no official patch exists, consider temporary mitigations such as disabling the vulnerable functionality or restricting access to the /admin/deletedoctorclinic.php endpoint via network controls (e.g., IP whitelisting, VPN access). 2. Input validation and sanitization: Implement robust input validation and parameterized queries or prepared statements in the affected code to prevent SQL injection. 3. Web Application Firewall (WAF): Deploy or update WAF rules to detect and block SQL injection attempts targeting the 'clinic' parameter. 4. Access controls: Restrict administrative interface access to trusted personnel and networks only, using strong authentication and network segmentation. 5. Monitoring and logging: Enhance monitoring of database queries and web server logs to detect anomalous activities indicative of exploitation attempts. 6. Incident response readiness: Prepare to respond to potential exploitation by having backup and recovery plans, especially for critical healthcare data. 7. Vendor engagement: Engage with the vendor for timely updates and security advisories and encourage them to release patches if not yet available.