CVE-2025-9739 is a SQL Injection vulnerability identified in version 1.0 of the Campcodes Online Water Billing System, specifically within the /process.php file. The vulnerability arises due to improper sanitization or validation of the 'Username' parameter, which allows an attacker to inject malicious SQL code remotely without requiring authentication or user interaction. This flaw enables an attacker to manipulate backend database queries, potentially leading to unauthorized data access, data modification, or disruption of service. The CVSS 4.0 base score is 6.9 (medium severity), reflecting the network attack vector, low complexity, no privileges or user interaction needed, and limited impact on confidentiality, integrity, and availability. Although no public exploits are currently known in the wild, the vulnerability has been publicly disclosed, increasing the risk of exploitation. The absence of available patches or mitigations from the vendor further exacerbates the threat. The vulnerability's exploitation could allow attackers to extract sensitive customer data, alter billing information, or disrupt billing operations, which are critical for utility providers relying on this system.

For European organizations, particularly municipal water utilities or private water service providers using the Campcodes Online Water Billing System, this vulnerability poses significant risks. Exploitation could lead to unauthorized disclosure of customer personal and billing data, violating GDPR and other data protection regulations, resulting in legal and financial penalties. Data integrity could be compromised, leading to incorrect billing, revenue loss, and customer trust erosion. Availability impacts could disrupt billing operations, affecting service continuity and customer satisfaction. Given the critical nature of water utilities as essential services, successful exploitation could also have broader societal impacts. The medium severity rating suggests that while the vulnerability is serious, it may not lead to full system compromise or widespread disruption without additional attack steps.

Organizations should immediately conduct an inventory to identify any deployment of Campcodes Online Water Billing System version 1.0. Since no official patches are currently available, mitigation should focus on implementing web application firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting the 'Username' parameter in /process.php. Input validation and parameterized queries should be enforced if source code access is available to developers or integrators. Network segmentation and strict access controls should limit exposure of the billing system to only trusted internal networks. Continuous monitoring of logs for suspicious database query patterns or anomalous access attempts is recommended. Additionally, organizations should prepare incident response plans specific to potential data breaches involving billing information and ensure compliance with GDPR breach notification requirements. Engaging with the vendor for timely patch releases and updates is critical.