CVE-2025-6906 is a critical SQL Injection vulnerability identified in version 1.0 of the code-projects Car Rental System, specifically within the /login.php file. The vulnerability arises from improper sanitization or validation of the 'uname' parameter, which is used during the login process. An attacker can remotely manipulate this parameter to inject malicious SQL code, potentially allowing unauthorized access to the backend database. This could lead to unauthorized data retrieval, modification, or deletion, compromising the confidentiality, integrity, and availability of the system's data. The vulnerability requires no authentication or user interaction to exploit, making it accessible to remote attackers without prior access. Although the CVSS 4.0 score is 6.9 (medium severity), the nature of SQL injection vulnerabilities often warrants heightened concern due to their potential to cause significant damage. No patches or fixes have been published yet, and no known exploits are currently observed in the wild, but the exploit details have been publicly disclosed, increasing the risk of exploitation by opportunistic attackers.

For European organizations using the code-projects Car Rental System 1.0, this vulnerability poses a significant risk. Exploitation could lead to unauthorized access to sensitive customer data, including personal identification and payment information, which would violate GDPR and other data protection regulations, potentially resulting in heavy fines and reputational damage. Additionally, attackers could manipulate booking data or disrupt service availability, impacting business operations and customer trust. Given the remote exploitability without authentication, attackers could target multiple organizations en masse. The impact extends beyond data breaches to potential operational disruptions and compliance violations, which are critical concerns for European enterprises in the travel and transportation sectors.

Immediate mitigation should focus on input validation and parameterized queries to prevent SQL injection. Developers should refactor the /login.php script to use prepared statements or stored procedures that safely handle user inputs. Until a vendor patch is released, organizations should implement Web Application Firewalls (WAFs) with specific rules to detect and block SQL injection attempts targeting the 'uname' parameter. Regular security audits and code reviews should be conducted to identify similar vulnerabilities. Additionally, monitoring login attempts and database query logs for anomalous activity can help detect exploitation attempts early. Organizations should also consider isolating the affected application from critical internal networks and enforce strict access controls. Finally, applying the principle of least privilege to database accounts used by the application can limit the potential damage of a successful injection.