CVE-2025-63949 is a reflected Cross-Site Scripting (XSS) vulnerability identified in the yohanawi Hotel Management System, specifically within the 'error' parameter of the pages/room.php script. Reflected XSS occurs when untrusted user input is immediately included in a web page's response without proper sanitization or encoding, allowing attackers to inject malicious JavaScript code. In this case, an attacker crafts a URL containing a malicious payload in the 'error' parameter, which, when visited by a victim, causes the victim's browser to execute the injected script. This can lead to theft of session cookies, redirection to malicious sites, or execution of arbitrary actions on behalf of the user. The vulnerability has a CVSS 3.1 base score of 6.1, reflecting a medium severity level. The vector string (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) indicates that the attack can be performed remotely over the network with low attack complexity, requires no privileges, but does require user interaction (clicking a malicious link). The scope is changed (S:C), meaning the vulnerability affects resources beyond the vulnerable component, and it impacts confidentiality and integrity to a limited extent but does not affect availability. No patches or fixes are currently linked, and no known exploits have been reported in the wild. The vulnerability is classified under CWE-79, which is the standard classification for Cross-Site Scripting issues. The lack of specified affected versions suggests all current versions of the yohanawi Hotel Management System may be vulnerable. This vulnerability is particularly concerning for web applications handling sensitive user data, such as hotel booking and management systems, where session hijacking or data theft can have significant consequences.

For European organizations, especially those in the hospitality and tourism sectors using the yohanawi Hotel Management System, this vulnerability poses a risk of client-side attacks that can compromise user sessions and data confidentiality. Attackers could exploit this XSS flaw to steal authentication cookies, enabling unauthorized access to user accounts or administrative functions. This could lead to data breaches involving personal customer information, booking details, and payment data, potentially violating GDPR and other data protection regulations. The reflected nature of the XSS means that phishing campaigns could be crafted to lure employees or customers into clicking malicious links, increasing the risk of targeted attacks. Although the vulnerability does not directly impact system availability, the resulting compromise of user accounts or data integrity could disrupt business operations and damage organizational reputation. The medium severity rating indicates a moderate risk, but the ease of exploitation and lack of required privileges make it a relevant threat vector that should be addressed promptly.

To mitigate CVE-2025-63949, organizations should implement strict input validation and output encoding on the 'error' parameter in pages/room.php to ensure that any user-supplied data is properly sanitized before being reflected in the web page. Employing Content Security Policy (CSP) headers can help restrict the execution of unauthorized scripts. Web application firewalls (WAFs) can be configured to detect and block common XSS attack patterns targeting this parameter. Regular security code reviews and penetration testing focused on input handling should be conducted to identify and remediate similar vulnerabilities. User education is also critical; employees and customers should be trained to recognize phishing attempts and avoid clicking suspicious links. Since no official patches are currently available, organizations should consider isolating or restricting access to vulnerable components until a fix is released. Monitoring web logs for unusual request patterns targeting the 'error' parameter can help detect exploitation attempts early. Finally, updating or migrating to a more secure hotel management system should be considered if timely patches are not forthcoming.