CVE-2025-9511 is a SQL Injection vulnerability identified in version 1.0 of the itsourcecode Apartment Management System, specifically within the /visitor/addvisitor.php file. The vulnerability arises due to improper sanitization or validation of the 'ID' parameter, which an attacker can manipulate to inject malicious SQL code. This injection flaw allows remote attackers to execute arbitrary SQL commands on the backend database without requiring authentication or user interaction. The vulnerability is remotely exploitable over the network, increasing its risk profile. The CVSS 4.0 base score of 6.9 (medium severity) reflects that the attack vector is network-based (AV:N), requires no privileges (PR:N), no user interaction (UI:N), and has partial impacts on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). Although no known exploits are currently observed in the wild, public exploit code is available, which could facilitate exploitation by threat actors. The lack of available patches or mitigation guidance from the vendor increases the urgency for affected organizations to implement compensating controls. The vulnerability could allow attackers to extract sensitive data, modify or delete records, or disrupt the availability of the apartment management system, potentially impacting tenant data confidentiality and operational continuity.

For European organizations using the itsourcecode Apartment Management System 1.0, this vulnerability poses a significant risk to the confidentiality, integrity, and availability of tenant and visitor data. Exploitation could lead to unauthorized disclosure of personally identifiable information (PII), including visitor logs and tenant details, which would violate GDPR requirements and potentially result in regulatory penalties. Additionally, attackers could alter or delete critical records, disrupting property management operations and causing financial and reputational damage. Given the remote exploitability without authentication, attackers could target multiple installations across Europe, especially in organizations managing large residential complexes or commercial properties. The medium severity rating suggests moderate but tangible risk, particularly if the system is integrated with other critical infrastructure or used in multi-tenant environments. The absence of patches means that organizations must proactively address the risk to prevent data breaches and service interruptions.

1. Immediate mitigation should include implementing web application firewall (WAF) rules to detect and block SQL injection attempts targeting the /visitor/addvisitor.php endpoint, focusing on anomalous input patterns in the 'ID' parameter. 2. Conduct thorough input validation and sanitization on all user-supplied data, especially the 'ID' parameter, using parameterized queries or prepared statements to prevent SQL injection. 3. Restrict database user permissions to the minimum necessary, limiting the impact of any successful injection. 4. Monitor application and database logs for suspicious queries or errors indicative of injection attempts. 5. If possible, isolate the vulnerable system from public internet access or restrict access via VPN or IP whitelisting until a vendor patch is available. 6. Engage with the vendor or community to obtain or develop patches or updates addressing this vulnerability. 7. Perform regular security assessments and code reviews on the application to identify and remediate similar vulnerabilities proactively.