CVE-2025-11390 is a cross-site scripting vulnerability identified in version 1.0 of the PHPGurukul Cyber Cafe Management System. The vulnerability resides in the /search.php component, specifically in the handling of the POST parameter 'searchdata'. Due to insufficient input validation and output encoding, an attacker can inject malicious JavaScript code that executes in the context of the victim's browser when the crafted input is processed and rendered. This flaw allows remote attackers to perform XSS attacks without requiring authentication, increasing the attack surface. The vulnerability has a CVSS 4.0 base score of 5.3, indicating medium severity, with an attack vector of network (remote), low attack complexity, no privileges required, but requiring user interaction to trigger the payload. The impact primarily affects confidentiality and integrity by enabling session hijacking, theft of cookies or credentials, and potential manipulation of the user interface. Although no active exploits have been reported in the wild, the public availability of exploit code raises the risk of exploitation. The vulnerability affects only version 1.0 of the product, and no official patches have been linked yet. Organizations using this system should prioritize remediation to prevent exploitation.

For European organizations, the impact of this vulnerability can be significant in environments where PHPGurukul Cyber Cafe Management System is deployed, such as internet cafes, public access points, or small ISPs managing user sessions. Successful exploitation can lead to theft of user credentials, session tokens, or personal data, undermining user privacy and trust. It can also facilitate further attacks such as phishing or malware distribution by injecting malicious scripts. The integrity of the management system's interface can be compromised, potentially disrupting operations or misleading users. Although the vulnerability does not directly affect availability, the reputational damage and potential regulatory consequences related to data breaches under GDPR could be substantial. Organizations operating in sectors with high compliance requirements or handling sensitive user data must address this vulnerability promptly to avoid legal and financial repercussions.

To mitigate CVE-2025-11390, organizations should implement strict input validation and output encoding on the 'searchdata' POST parameter within /search.php to neutralize malicious scripts. Employing security libraries or frameworks that automatically handle XSS prevention is recommended. Until an official patch is released, consider deploying web application firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting this parameter. Conduct thorough code reviews and penetration testing focused on input handling in the affected module. Educate users and administrators about the risks of XSS and encourage cautious behavior when interacting with web interfaces. Additionally, monitor logs for unusual activity that may indicate attempted exploitation. Once vendor patches become available, apply them promptly. Finally, consider isolating or restricting access to the vulnerable system to trusted networks to reduce exposure.