CVE-2025-13075 is a SQL injection vulnerability identified in the Responsive Hotel Site version 1.0 developed by code-projects. The vulnerability exists in the /admin/usersettingdel.php file, where the 'eid' parameter is improperly sanitized, allowing an attacker to inject malicious SQL code. This injection flaw enables remote exploitation without user interaction or authentication, although the CVSS vector indicates that a high privilege level is required (PR:H). The vulnerability impacts the confidentiality, integrity, and availability of the backend database by potentially allowing unauthorized data retrieval, modification, or deletion. The CVSS 4.0 score of 5.1 reflects a medium severity due to limited scope and required privileges. The exploit code has been publicly disclosed, which increases the risk of exploitation despite no known active attacks in the wild. The vulnerability is particularly critical for organizations relying on this software for hotel management, as attackers could manipulate user settings or extract sensitive customer data. The lack of patches or official fixes necessitates immediate mitigation through secure coding practices such as input validation, parameterized queries, and access control hardening.

For European organizations, especially those in the hospitality sector using the Responsive Hotel Site software, this vulnerability poses a risk of unauthorized access to sensitive customer and operational data. Exploitation could lead to data breaches involving personal identifiable information (PII), financial data, or booking details, damaging customer trust and incurring regulatory penalties under GDPR. Additionally, attackers could alter or delete critical configuration or user data, disrupting hotel operations and causing service outages. The medium severity and requirement for high privileges somewhat limit the threat to internal or poorly secured administrative interfaces, but the public availability of exploit code increases the likelihood of attacks. Organizations with inadequate network segmentation or weak administrative access controls are particularly vulnerable. The impact extends beyond data loss to potential reputational damage and financial costs associated with incident response and remediation.

Organizations should immediately audit and restrict access to the /admin/usersettingdel.php endpoint, ensuring only authorized administrators can reach it. Implement strict input validation and sanitization on the 'eid' parameter to prevent injection of malicious SQL code. Refactor the codebase to use prepared statements or parameterized queries instead of dynamic SQL concatenation. Conduct a thorough code review of all administrative modules for similar injection flaws. Deploy web application firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting this parameter. Monitor logs for suspicious activity related to the 'eid' parameter and unusual database queries. If possible, isolate the administrative interface behind VPNs or IP whitelisting to reduce exposure. Finally, maintain regular backups of databases and configurations to enable recovery in case of data tampering or loss.