CVE-2025-3973 is a SQL Injection vulnerability identified in version 1.0 of the PHPGurukul COVID19 Testing Management System, specifically within the /check_availability.php file. The vulnerability arises from improper sanitization of the 'mobnumber' parameter, which allows an attacker to inject malicious SQL code remotely without requiring authentication or user interaction. This flaw can be exploited to manipulate backend database queries, potentially leading to unauthorized data access, data modification, or deletion. The vulnerability may also affect other parameters, although these have not been explicitly confirmed. The CVSS 4.0 base score is 6.9, indicating a medium severity level, with an attack vector of network (remote), low attack complexity, no privileges or user interaction required, and limited impact on confidentiality, integrity, and availability. No known exploits have been reported in the wild yet, but the exploit details have been publicly disclosed, increasing the risk of exploitation. The vulnerability affects only version 1.0 of the product, and no official patches or mitigations have been published by the vendor at this time.

For European organizations, this vulnerability poses a significant risk, especially for healthcare providers, testing centers, and public health authorities using the PHPGurukul COVID19 Testing Management System version 1.0. Exploitation could lead to unauthorized access to sensitive patient data, including personal identifiers and test results, undermining patient privacy and violating GDPR regulations. Data integrity could be compromised, potentially resulting in falsified test availability or results, which could disrupt public health responses and erode trust in testing infrastructure. Availability impacts are limited but could occur if attackers execute destructive SQL commands. Given the critical nature of COVID-19 testing data, any compromise could have cascading effects on healthcare operations and pandemic management efforts in Europe.

Organizations should immediately audit their use of the PHPGurukul COVID19 Testing Management System to identify any deployments of version 1.0. Since no official patch is currently available, mitigation should focus on implementing Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection patterns targeting the 'mobnumber' parameter and other input fields. Input validation and parameterized queries should be enforced at the application level if source code access is available. Network segmentation should isolate the testing management system from critical infrastructure to limit lateral movement. Regular database backups and monitoring for unusual query patterns or data anomalies are essential to detect and recover from potential exploitation. Organizations should also monitor threat intelligence feeds for any emerging exploits and vendor updates. Finally, consider migrating to updated or alternative systems that have addressed this vulnerability.