CVE-2025-39504 is a critical SQL Injection vulnerability (CWE-89) affecting the GoodLayers Hotel plugin, versions up to 3.1.4. This vulnerability arises from improper neutralization of special elements in SQL commands, allowing an attacker to perform Blind SQL Injection attacks. Blind SQL Injection enables attackers to infer database information by sending crafted queries and analyzing the application's responses, even when direct output of database errors or data is not available. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component, potentially impacting the confidentiality of the entire database (C:H), while integrity is not affected (I:N) and availability impact is low (A:L). Although no known exploits are currently reported in the wild, the high CVSS score of 9.3 reflects the severe risk posed by this vulnerability. The lack of available patches at the time of publication increases the urgency for mitigation. GoodLayers Hotel is a WordPress plugin used primarily in the hospitality sector for hotel booking and management websites, which often handle sensitive customer data and payment information. The vulnerability could allow attackers to extract sensitive data such as customer personal details, booking information, or payment credentials, leading to significant data breaches and privacy violations.

For European organizations, especially those in the hospitality and tourism sectors using the GoodLayers Hotel plugin, this vulnerability poses a significant risk. Exploitation could lead to unauthorized disclosure of personal data protected under GDPR, resulting in regulatory penalties and reputational damage. The ability to extract sensitive customer and booking data could also facilitate identity theft, fraud, and financial losses. Additionally, the compromise of backend databases could disrupt hotel operations, impacting availability of booking services and customer trust. Given the critical nature of the vulnerability and the absence of patches, European organizations face an elevated risk of targeted attacks, especially as attackers often focus on hospitality businesses due to the volume of personal and payment data processed. The cross-site impact (scope changed) further amplifies the potential damage, as attackers might leverage this vulnerability to access other connected systems or escalate privileges within the affected environment.

Immediate mitigation steps should include: 1) Conducting an inventory to identify all instances of the GoodLayers Hotel plugin in use across organizational websites. 2) Applying any available vendor patches or updates as soon as they are released. Since no patches are currently available, organizations should implement Web Application Firewall (WAF) rules specifically designed to detect and block SQL Injection attempts targeting this plugin. 3) Employing input validation and parameterized queries at the application level if custom modifications exist. 4) Restricting database user permissions to the minimum necessary to limit the impact of any injection attacks. 5) Monitoring web server and database logs for unusual query patterns or failed injection attempts. 6) Considering temporary disabling or replacing the plugin with alternative solutions until a secure version is released. 7) Educating web administrators and developers about the risks and signs of SQL Injection attacks to improve detection and response capabilities. These steps go beyond generic advice by focusing on immediate risk reduction in the absence of patches and emphasizing proactive monitoring and access control.