CVE-2025-34272 is a vulnerability classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) affecting Nagios Log Server versions prior to 2024R2.0.3. The issue arises when a user’s configured default dashboard is deleted; instead of falling back to an empty or neutral default dashboard, the system may present an unexpected dashboard as the user's default view. This unexpected dashboard could belong to another user or contain information that the current user should not have access to, depending on the dashboard sharing and access control policies configured in the product. The vulnerability stems from improper handling of dashboard state fallback logic within the application. The CVSS 4.0 base score is 5.3 (medium severity), with attack vector being network-based (AV:N), low attack complexity (AC:L), no authentication required (AT:N), and no user interaction needed (UI:N). The vulnerability impacts confidentiality primarily, with limited impact on integrity or availability. No known exploits have been reported in the wild as of now. The vulnerability affects all deployments of Nagios Log Server prior to the fixed version 2024R2.0.3, which is designed to ensure a reliable fallback to an empty default dashboard, preventing unauthorized exposure of dashboards and their contained data. This vulnerability is particularly relevant in environments where dashboards contain sensitive operational or security data and where dashboard sharing policies are permissive or complex.

For European organizations, the exposure of sensitive information through this vulnerability could lead to unauthorized disclosure of operational, security, or business-critical data contained within Nagios Log Server dashboards. This may include log data, monitoring alerts, or configuration details that could aid attackers in reconnaissance or lateral movement. Organizations in sectors such as finance, energy, telecommunications, and government—where Nagios Log Server is commonly used for infrastructure monitoring—face increased risk. The unintended privilege exposure could also allow lower-privileged users to gain insights or access beyond their authorization, potentially violating data protection regulations such as GDPR. This could result in regulatory penalties, reputational damage, and operational disruptions. Since the vulnerability can be exploited remotely without authentication or user interaction, it increases the attack surface and risk of automated exploitation attempts. Although no exploits are currently known, the medium severity score and ease of exploitation warrant proactive remediation to protect sensitive monitoring data and maintain compliance with European cybersecurity standards.

The primary mitigation is to upgrade Nagios Log Server to version 2024R2.0.3 or later, where the fallback logic for deleted default dashboards has been corrected to prevent exposure. Organizations should audit their current dashboard sharing and access control policies to ensure that dashboards are not overly permissive and that sensitive information is appropriately segmented. Implement strict role-based access controls (RBAC) and minimize dashboard sharing to only necessary users. Regularly review user permissions and dashboard configurations to detect and remediate any unintended access. Additionally, monitor logs for unusual access patterns to dashboards that could indicate exploitation attempts. Employ network segmentation and firewall rules to limit access to Nagios Log Server interfaces to trusted administrative networks. Finally, incorporate this vulnerability into vulnerability management and patching cycles to ensure timely updates and reduce exposure windows.