CVE-2025-15322 is an authorization vulnerability identified in Tanium Server, a widely used endpoint management and security platform. The flaw stems from improper access control mechanisms that allow users with limited privileges (PR:L) to access certain data or resources that should be restricted. The vulnerability affects Tanium Server versions 7.6.2.1327, 7.6.4.2160, and 7.7.3.8231. According to the CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N), the attack can be performed remotely over the network with low complexity and does not require user interaction. The scope remains unchanged, meaning the vulnerability affects only the privileges of the initially compromised component. The impact is limited to confidentiality loss, with no direct impact on integrity or availability. No public exploits have been reported yet, indicating limited active exploitation. Tanium Server is critical in enterprise environments for endpoint visibility and control, so unauthorized data access could expose sensitive operational or security information. The vulnerability was reserved late 2025 and published early 2026, indicating a recent discovery and disclosure.

For European organizations, the primary impact is unauthorized disclosure of sensitive information managed or stored within Tanium Server. This could include endpoint telemetry, configuration data, or security event information, potentially aiding attackers in reconnaissance or lateral movement. While the vulnerability does not allow modification or disruption of services, confidentiality breaches can undermine trust and compliance with data protection regulations such as GDPR. Organizations in sectors with stringent data privacy requirements or those relying heavily on Tanium for security operations may face increased risk. Additionally, unauthorized access could facilitate further attacks if attackers leverage exposed data. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially in targeted attacks against critical infrastructure or large enterprises.

Organizations should monitor Tanium's official channels for patches addressing CVE-2025-15322 and apply them promptly once released. In the interim, review and tighten user privilege assignments within Tanium Server to ensure the principle of least privilege is enforced, minimizing the number of users with elevated access. Implement network segmentation and restrict access to Tanium Server management interfaces to trusted administrators and secure networks. Enable detailed logging and monitoring of Tanium Server access to detect anomalous activities that could indicate exploitation attempts. Conduct regular audits of user roles and permissions to identify and remediate excessive privileges. Consider deploying compensating controls such as multi-factor authentication for administrative access and integrating Tanium Server logs into centralized SIEM solutions for enhanced visibility.