CVE-2025-11055 is a SQL Injection vulnerability identified in version 1.0 of the SourceCodester Online Hotel Reservation System. The vulnerability resides in the /admin/updateaddress.php file, specifically in the handling of the 'address' parameter. An attacker can manipulate this parameter to inject malicious SQL code, which the system executes without proper sanitization or parameterization. This flaw allows remote attackers to execute arbitrary SQL commands on the backend database without requiring authentication or user interaction. The vulnerability has a CVSS 4.0 base score of 6.9, indicating a medium severity level. The attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact on confidentiality, integrity, and availability is limited (VC:L, VI:L, VA:L), meaning that while the attacker can potentially read, modify, or delete some data, the scope and severity of damage are somewhat constrained. The vulnerability is exploitable remotely, and although no known exploits are currently in the wild, the exploit code has been publicly disclosed, increasing the risk of exploitation. The lack of patches or official remediation at the time of publication further elevates the urgency for affected users to implement mitigations. SQL Injection vulnerabilities are critical because they can lead to unauthorized data access, data corruption, or even full system compromise depending on the database privileges and application architecture. In this case, the vulnerability affects a hotel reservation system, which typically manages sensitive customer data such as personal identification, contact details, and booking information, making it a valuable target for attackers.

For European organizations using the SourceCodester Online Hotel Reservation System version 1.0, this vulnerability poses a significant risk to the confidentiality and integrity of customer data. Exploitation could lead to unauthorized disclosure of personal information, violating GDPR requirements and potentially resulting in regulatory fines and reputational damage. Data manipulation could disrupt booking operations, causing service availability issues and financial losses. Given the hospitality sector's reliance on trust and data privacy, a successful attack could erode customer confidence and impact business continuity. Additionally, attackers might leverage this vulnerability as a foothold to pivot into internal networks, especially if the reservation system is integrated with other enterprise systems. The medium severity rating suggests that while the vulnerability is serious, it may not lead to full system takeover without additional vulnerabilities or misconfigurations. However, the public availability of exploit code increases the likelihood of opportunistic attacks, particularly targeting smaller hotels or chains with limited cybersecurity resources.

1. Immediate mitigation should include implementing input validation and prepared statements or parameterized queries in the /admin/updateaddress.php script to prevent SQL injection. 2. If source code modification is not immediately feasible, deploying a Web Application Firewall (WAF) with rules to detect and block SQL injection attempts targeting the 'address' parameter can reduce risk. 3. Restrict network access to the administration interface to trusted IP addresses or VPN-only access to limit exposure. 4. Conduct a thorough security audit of the entire application to identify and remediate other potential injection points or vulnerabilities. 5. Regularly monitor logs for suspicious database queries or failed injection attempts to detect exploitation attempts early. 6. Plan and apply vendor patches or updates as soon as they become available. 7. Educate administrative users on security best practices and ensure strong authentication mechanisms are in place to reduce risk from other attack vectors. 8. Consider isolating the database with least privilege principles, ensuring the application account has only necessary permissions to limit damage from successful injection.