CVE-2025-63949 identifies a reflected Cross-Site Scripting (XSS) vulnerability in the yohanawi Hotel Management System, specifically within the 'error' parameter of the pages/room.php script. Reflected XSS occurs when user-supplied input is immediately echoed by the web application without proper sanitization or encoding, allowing attackers to craft malicious URLs that execute arbitrary JavaScript in the victim's browser. This vulnerability requires no authentication and no user interaction beyond clicking a crafted link or visiting a malicious page referencing the vulnerable parameter. The attacker can exploit this flaw to perform actions such as session hijacking, stealing cookies, redirecting users to phishing sites, or delivering malware. Although no public exploits are currently known, the vulnerability is publicly disclosed and thus could be targeted by attackers. The lack of a CVSS score suggests the need for a manual severity assessment. The vulnerability affects all versions of the yohanawi system where the parameter is vulnerable, as no specific affected versions are listed. The absence of patches or mitigation links indicates that users must implement their own input validation and output encoding measures. This vulnerability is particularly concerning for hotel management systems, which handle sensitive customer data and payment information, increasing the risk of data breaches and reputational damage.

For European organizations, especially those in the hospitality sector using the yohanawi Hotel Management System, this vulnerability poses a significant risk to customer data confidentiality and system integrity. Exploitation could lead to theft of session cookies, enabling attackers to impersonate legitimate users or administrators, potentially leading to unauthorized access to sensitive booking and payment information. The reflected XSS attack can also be used to deliver further malware or phishing attacks targeting customers or employees, damaging trust and causing financial losses. Additionally, successful exploitation could result in regulatory non-compliance issues under GDPR due to inadequate protection of personal data. The impact extends beyond individual organizations to the broader tourism industry, potentially affecting customer confidence in digital services. Since the vulnerability requires no authentication and can be triggered remotely, the attack surface is broad, increasing the likelihood of exploitation if unmitigated.

To mitigate this vulnerability, organizations should immediately implement strict input validation and output encoding on the 'error' parameter in pages/room.php to neutralize malicious scripts. Employing context-aware encoding (e.g., HTML entity encoding) ensures that injected scripts are not executed by browsers. Deploying a robust Content Security Policy (CSP) can further restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. Regularly updating and patching the yohanawi Hotel Management System when vendor updates become available is critical. Additionally, security teams should conduct thorough code reviews and penetration testing focusing on input handling. User education on recognizing suspicious links and phishing attempts can reduce the risk of successful exploitation. Monitoring web traffic for unusual patterns and implementing Web Application Firewalls (WAFs) with XSS detection rules can provide additional layers of defense. Finally, organizations should prepare incident response plans specific to web-based attacks to quickly contain and remediate any exploitation.