CVE-2025-11662 is a SQL injection vulnerability identified in SourceCodester Best Salon Management System version 1.0, specifically within the /booking.php script. The vulnerability arises from inadequate sanitization of the serv_id parameter, which is directly used in SQL queries without proper validation or parameterization. This allows an unauthenticated remote attacker to inject arbitrary SQL commands, potentially retrieving, modifying, or deleting sensitive data stored in the backend database. The vulnerability does not require user interaction or prior authentication, increasing its exploitability. The CVSS 4.0 score of 6.9 reflects a medium severity, considering the attack vector is network-based with low complexity and no privileges required, but with limited impact on confidentiality, integrity, and availability (low to limited). Although no confirmed exploits are currently active in the wild, proof-of-concept exploit code has been publicly released, raising the risk of imminent attacks. The affected product is typically deployed by small and medium-sized businesses in the salon management sector, which may not have robust security controls, making them vulnerable targets. The lack of available patches at the time of disclosure necessitates immediate mitigation through code review and secure coding practices. The vulnerability highlights the critical need for input validation and use of prepared statements in web applications handling user-supplied data.

For European organizations, particularly small and medium enterprises in the beauty and salon industry using SourceCodester Best Salon Management System 1.0, this vulnerability poses a significant risk of data breaches involving customer information, booking details, and potentially payment data if stored in the same database. Exploitation could lead to unauthorized disclosure of sensitive personal data, violating GDPR requirements and resulting in regulatory penalties. Additionally, attackers could alter or delete booking records, disrupting business operations and causing reputational damage. The remote and unauthenticated nature of the attack vector means that attackers can exploit this vulnerability from anywhere, increasing the threat landscape. The limited availability of patches and the public release of exploit code further elevate the risk. Organizations lacking advanced security monitoring may not detect exploitation attempts promptly, increasing potential damage. The impact extends beyond confidentiality to integrity and availability, as database manipulation can affect service continuity and trustworthiness of business data.

European organizations should immediately audit their deployments of SourceCodester Best Salon Management System to identify affected versions (1.0). Until an official patch is released, implement the following mitigations: 1) Conduct a thorough code review of /booking.php and any other scripts handling user input to ensure all inputs, especially serv_id, are properly sanitized and validated. 2) Refactor database queries to use parameterized statements or prepared queries to prevent injection. 3) Employ web application firewalls (WAFs) with custom rules to detect and block SQL injection patterns targeting serv_id parameters. 4) Monitor database logs and application logs for unusual query patterns or errors indicative of injection attempts. 5) Restrict network access to the management system where possible, limiting exposure to trusted IPs. 6) Educate staff about the vulnerability and encourage prompt reporting of suspicious activity. 7) Plan for rapid deployment of official patches once available from SourceCodester. 8) Consider isolating the affected system in a segmented network zone to reduce lateral movement risk.