CVE-2025-9644 is a SQL Injection vulnerability identified in version 1.0 of the itsourcecode Apartment Management System, specifically within the /setting/bill_setup.php file. The vulnerability arises from improper sanitization or validation of the 'txtBillType' parameter, which is susceptible to malicious input manipulation. An attacker can exploit this flaw remotely without requiring authentication or user interaction, by crafting specially designed input to the vulnerable parameter. This allows the attacker to inject arbitrary SQL commands that the backend database will execute. The consequences of successful exploitation include unauthorized access to sensitive data, modification or deletion of database records, and potentially full compromise of the underlying database server. The CVSS 4.0 base score is 6.9 (medium severity), reflecting the network attack vector, low attack complexity, no privileges or user interaction needed, and limited impact on confidentiality, integrity, and availability. Although no known exploits are currently reported in the wild, the public disclosure of the vulnerability increases the risk of exploitation. The lack of available patches or mitigation guidance from the vendor further elevates the threat level for users of this software. Given the nature of apartment management systems, which typically store tenant personal data, billing information, and possibly payment details, exploitation could lead to data breaches and financial fraud.

For European organizations using the itsourcecode Apartment Management System 1.0, this vulnerability poses a significant risk to the confidentiality and integrity of tenant and financial data. Unauthorized access to billing and personal information could lead to privacy violations under GDPR, resulting in regulatory penalties and reputational damage. Data manipulation could disrupt billing processes, causing financial losses and operational downtime. Since the vulnerability can be exploited remotely without authentication, attackers could target multiple installations across different organizations, amplifying the impact. Additionally, compromised systems might be leveraged as pivot points for further attacks within organizational networks. The medium severity rating suggests that while the vulnerability is serious, it may not lead to complete system takeover without additional vulnerabilities or misconfigurations. However, the sensitive nature of the data managed by apartment systems makes even moderate breaches impactful.

European organizations should immediately audit their deployments of the itsourcecode Apartment Management System to identify affected versions (1.0). In the absence of an official patch, organizations should implement the following mitigations: 1) Employ Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection patterns targeting the 'txtBillType' parameter. 2) Restrict network access to the management interface to trusted IP addresses or VPNs to reduce exposure. 3) Conduct input validation and sanitization at the application or proxy level to filter malicious inputs. 4) Monitor database logs for unusual queries or access patterns indicative of injection attempts. 5) Consider migrating to alternative, actively maintained apartment management solutions with secure coding practices. 6) Prepare incident response plans to quickly address potential breaches. 7) Educate IT staff on SQL injection risks and detection techniques. These targeted actions go beyond generic advice by focusing on the specific vulnerable parameter and the operational context of apartment management systems.