CVE-2025-4542 is a vulnerability identified in the Freeebird Hotel 酒店管理系统 API versions up to 1.2, specifically related to the file /src/main/java/cn/mafangui/hotel/tool/SessionInterceptor.java. The issue arises from a permissive cross-domain policy that allows untrusted domains to interact with the API. Cross-domain policies are mechanisms that control how resources on a web server can be accessed by web pages from different domains. A permissive policy that includes untrusted domains can lead to security risks such as unauthorized data access or manipulation via cross-origin requests. In this case, the vulnerability permits remote attackers to exploit the cross-domain policy, potentially enabling them to perform actions or access data that should be restricted. However, the attack complexity is high, meaning exploitation requires significant effort or specific conditions, and no privileges or authentication are needed, but user interaction is required. The CVSS 4.0 score is low (2.3), reflecting limited impact on confidentiality, integrity, and availability, and the exploit is difficult to execute. No known exploits are currently active in the wild, and no patches have been published yet. The vulnerability is classified as problematic but not critical, indicating it should be addressed but is not an immediate severe threat.

For European organizations using the Freeebird Hotel 酒店管理系统 API, this vulnerability could lead to unauthorized cross-origin interactions, potentially exposing sensitive hotel management data or enabling unauthorized actions within the system. Although the impact is low severity, it could still affect confidentiality and integrity of data, especially if attackers trick users into interacting with malicious domains. Given the hospitality sector's reliance on customer data and operational continuity, even low-severity vulnerabilities can contribute to reputational damage and regulatory scrutiny under GDPR if personal data is exposed. The high attack complexity and requirement for user interaction reduce the likelihood of widespread exploitation, but targeted attacks against specific hotels or chains using this system remain a concern. The absence of known active exploits lowers immediate risk but does not eliminate the need for vigilance.

Organizations should immediately review and restrict the cross-domain policies configured in the Freeebird Hotel API, ensuring only trusted domains are permitted. This involves auditing the SessionInterceptor.java implementation and updating it to enforce strict domain whitelisting. Since no patches are currently available, temporary mitigations include implementing web application firewalls (WAFs) to monitor and block suspicious cross-origin requests, and educating users to avoid interacting with untrusted links or domains related to the hotel management system. Additionally, organizations should monitor network traffic for unusual cross-domain activity and prepare to apply vendor patches once released. Conducting security code reviews and penetration testing focused on cross-origin resource sharing (CORS) policies can help identify and remediate similar issues proactively.