CVE-2025-6579 is a SQL Injection vulnerability identified in version 1.0 of the code-projects Car Rental System, specifically within the /message_admin.php file. The vulnerability arises from improper sanitization or validation of the 'Message' parameter, which is susceptible to malicious input manipulation. An attacker can remotely exploit this flaw without requiring any authentication or user interaction, by injecting crafted SQL commands through the vulnerable parameter. This can lead to unauthorized access to the backend database, potentially allowing the attacker to read, modify, or delete sensitive data, escalate privileges, or execute administrative operations on the database. The vulnerability has been publicly disclosed, increasing the risk of exploitation, although no known exploits in the wild have been reported yet. The CVSS 4.0 base score is 6.9 (medium severity), reflecting the ease of remote exploitation without privileges or user interaction, but with limited impact on confidentiality, integrity, and availability (each rated low). The vulnerability affects a niche product used in car rental management, which may be deployed in various organizations managing vehicle fleets and customer data. The lack of available patches or mitigations from the vendor increases the urgency for organizations to implement compensating controls.

For European organizations using the code-projects Car Rental System 1.0, this vulnerability poses a significant risk to the confidentiality and integrity of customer and operational data. Exploitation could lead to unauthorized data disclosure, including personal customer information and rental transaction records, potentially violating GDPR and other data protection regulations. Integrity compromise could disrupt rental operations, causing financial losses and reputational damage. Availability impact is less pronounced but could occur if database manipulation leads to service disruptions. Given the remote, unauthenticated nature of the exploit, attackers can target vulnerable systems over the internet, increasing the attack surface. Organizations in the transportation, logistics, and tourism sectors relying on this system may face operational interruptions and regulatory penalties. The public disclosure of the vulnerability further elevates the risk of opportunistic attacks, especially if no immediate patches or fixes are available.

Since no official patches or updates are currently available for the affected product version, European organizations should implement the following specific mitigations: 1) Deploy Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection patterns targeting the 'Message' parameter in /message_admin.php. 2) Conduct immediate code reviews and apply input validation and parameterized queries or prepared statements in the application code to sanitize inputs. 3) Restrict network access to the Car Rental System backend, limiting exposure to trusted internal networks or VPNs to reduce remote attack vectors. 4) Monitor database logs and application logs for unusual queries or error messages indicative of injection attempts. 5) Implement strict database user permissions, ensuring the application uses least privilege accounts to limit the impact of a successful injection. 6) Consider isolating the vulnerable system within segmented network zones to contain potential breaches. 7) Prepare incident response plans specific to SQL injection attacks, including data backup and recovery procedures. 8) Engage with the vendor or community to track the release of official patches and plan timely updates.