CVE-2025-50016 is a Stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the IP Based Login product developed by brijeshk89, up to version 2.4.2. The vulnerability arises due to improper neutralization of input during web page generation, allowing malicious scripts to be stored and later executed in the context of users accessing the affected application. This type of vulnerability typically occurs when user-supplied input is embedded in web pages without adequate sanitization or encoding, enabling attackers to inject arbitrary JavaScript code. The CVSS 3.1 base score is 5.9 (medium severity), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), requiring high privileges (PR:H), user interaction (UI:R), scope changed (S:C), and low impact on confidentiality, integrity, and availability (C:L/I:L/A:L). The requirement for high privileges and user interaction reduces the ease of exploitation, but the scope change means the vulnerability can affect components beyond the initially vulnerable module. Stored XSS can lead to session hijacking, credential theft, or execution of unauthorized actions on behalf of users. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability was published on June 20, 2025, and was reserved on June 11, 2025, indicating recent discovery. The affected product is an IP Based Login system, which likely manages authentication or access control based on IP addresses, making it a critical component in network security infrastructure where deployed.

For European organizations, this vulnerability poses a moderate risk primarily to web applications or authentication systems utilizing the brijeshk89 IP Based Login product. Exploitation could allow attackers to execute malicious scripts in the context of authenticated users, potentially leading to session hijacking, unauthorized actions, or data leakage. Given the requirement for high privileges and user interaction, the risk is somewhat mitigated but still significant in environments where privileged users interact with the vulnerable system. Organizations in sectors with stringent data protection requirements, such as finance, healthcare, and government, could face compliance issues and reputational damage if exploited. Additionally, since the vulnerability affects authentication mechanisms, it could undermine trust in access controls, potentially facilitating further attacks. The scope change in the CVSS vector suggests that the impact could extend beyond the immediate application, possibly affecting integrated systems or services. Although no exploits are known in the wild, the medium severity score and the nature of stored XSS warrant proactive mitigation to prevent potential targeted attacks.

1. Immediate mitigation should focus on input validation and output encoding: ensure that all user-supplied inputs are properly sanitized and encoded before being rendered in web pages, particularly in the IP Based Login interface. 2. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. 3. Conduct a thorough code review and security testing of the IP Based Login product, focusing on all input points and output rendering to identify and remediate similar injection flaws. 4. Restrict access to the IP Based Login system to trusted networks and users, minimizing exposure to potential attackers. 5. Monitor logs and user activity for unusual behavior that may indicate attempted exploitation, especially from privileged users. 6. Since no patches are currently available, coordinate with the vendor brijeshk89 for timely updates and apply patches as soon as they are released. 7. Educate privileged users about the risks of interacting with untrusted content and the importance of cautious behavior to reduce the likelihood of successful user interaction-based attacks. 8. Consider implementing multi-factor authentication (MFA) around the IP Based Login system to add an additional security layer, mitigating the risk if session hijacking occurs.