CVE-2025-70890 is a stored cross-site scripting (XSS) vulnerability identified in Cyber Cafe Management System version 1.0. This vulnerability arises from improper sanitization of the username parameter in the add-users.php endpoint. An attacker who has authenticated access to the system can inject arbitrary JavaScript code into this parameter. Because the payload is stored persistently on the server, it will execute in the context of any user who views the affected page, including administrators or other privileged users. The attack vector requires the attacker to be authenticated but does not require elevated privileges, making it accessible to any logged-in user. The vulnerability can lead to the compromise of user sessions, theft of sensitive information, or execution of unauthorized actions on behalf of victims. The CVSS 3.1 base score of 6.1 reflects a medium severity, with the vector indicating network attack vector, low attack complexity, no privileges required, but user interaction is necessary to trigger the payload. The scope is changed, meaning the vulnerability can affect resources beyond the vulnerable component. No patches or known exploits are currently documented, but the risk remains significant due to the persistent nature of stored XSS. The vulnerability is categorized under CWE-79, which is a common web application security weakness related to improper neutralization of input leading to script injection.

For European organizations, this vulnerability poses a risk primarily to entities using the Cyber Cafe Management System v1.0, which may include internet cafes, small business environments, or public access points. Exploitation could lead to session hijacking, credential theft, or unauthorized actions performed under the guise of legitimate users, potentially compromising confidentiality and integrity of user data. Although availability impact is low, the breach of trust and data confidentiality can have regulatory implications under GDPR, especially if personal data is exposed or manipulated. The requirement for authentication limits the attack surface but does not eliminate risk, as insider threats or compromised accounts could be leveraged. Organizations relying on this system for user management or access control should be aware that attackers could escalate privileges or pivot to other internal systems if the vulnerability is exploited. The lack of patches increases the urgency for mitigating controls. The impact is more pronounced in countries with higher deployment of cyber cafe management solutions or where such cafes serve as critical internet access points, potentially affecting a wide user base including tourists and local populations.

To mitigate CVE-2025-70890, organizations should implement strict input validation and sanitization on all user-supplied data, especially the username parameter in add-users.php. Employing output encoding techniques to neutralize scripts before rendering user input in the browser is essential. Since no official patch is currently available, consider deploying web application firewalls (WAFs) with custom rules to detect and block malicious script payloads targeting this endpoint. Limit user privileges to the minimum necessary to reduce the risk posed by authenticated attackers. Conduct regular security audits and penetration testing focused on XSS vulnerabilities. Educate users and administrators about the risks of stored XSS and encourage cautious behavior when interacting with user-generated content. Monitor logs for suspicious activity related to user creation or modification. If feasible, isolate the Cyber Cafe Management System from critical internal networks to contain potential exploitation. Finally, maintain awareness of vendor updates or patches and apply them promptly once released.