CVE-2025-5711 is a critical SQL Injection vulnerability identified in version 1.0 of the code-projects Real Estate Property Management System, specifically within the /Admin/InsertCity.php file. The vulnerability arises due to improper sanitization or validation of the 'cmbState' parameter, which is used in a database query. An attacker can manipulate this parameter to inject malicious SQL code, potentially allowing unauthorized access to or modification of the backend database. The vulnerability is remotely exploitable without requiring authentication or user interaction, increasing its risk profile. The disclosed exploit enables attackers to execute arbitrary SQL commands, which could lead to data leakage, data corruption, or unauthorized administrative actions within the application. The CVSS 4.0 base score is 6.9, reflecting a medium severity rating, primarily due to the lack of authentication and user interaction requirements, but with limited impact on confidentiality, integrity, and availability. However, the vulnerability's critical classification by the vendor suggests that the actual impact could be significant depending on the deployment context and database sensitivity. No patches have been published yet, and no known exploits are reported in the wild, but public disclosure increases the risk of exploitation attempts.

For European organizations using the affected Real Estate Property Management System, this vulnerability poses a significant risk to the confidentiality and integrity of sensitive real estate data, including client information, property details, and transaction records. Exploitation could lead to unauthorized data access, data manipulation, or disruption of property management operations. Given the critical nature of real estate data in compliance with GDPR and other data protection regulations, a breach could result in severe legal and financial consequences. Furthermore, attackers could leverage this vulnerability as a foothold to pivot into broader corporate networks, potentially compromising additional systems. The remote and unauthenticated nature of the exploit increases the likelihood of attacks, especially in environments where the system is exposed to the internet without adequate network segmentation or firewall protections.

Organizations should immediately audit their deployments of the code-projects Real Estate Property Management System version 1.0 to identify vulnerable instances. Until an official patch is released, it is crucial to implement strict input validation and sanitization on the 'cmbState' parameter at the web application firewall (WAF) or reverse proxy level to block SQL injection payloads. Employing parameterized queries or prepared statements in the application code is the definitive fix and should be prioritized once source code access is available. Network-level mitigations include restricting access to the administration interface to trusted IP addresses and enforcing VPN access for administrative functions. Continuous monitoring of logs for suspicious database queries or unusual application behavior is recommended to detect exploitation attempts early. Additionally, organizations should prepare incident response plans specific to SQL injection attacks and ensure backups of critical data are current and securely stored.