CVE-2026-69267
Summary
by MITRE • 09/08/2026
Insufficient granularity of access control in Windows Connected User Experiences and Telemetry allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability identified as insufficient granularity of access control within the Windows Connected User Experiences and Telemetry subsystem represents a critical flaw in the operating system's privilege management architecture. This component, often referred to by its service name DiagTrack or Diagnostics Tracking Service, is responsible for collecting diagnostic data, usage metrics, and telemetry information from various applications and system components on behalf of Microsoft. The core issue lies in the overly permissive access control lists applied to specific endpoints within this subsystem. While the service itself requires elevated privileges to function correctly across the operating system, certain internal interfaces or configuration files were exposed with permissions that allowed any authenticated local user to interact with them without sufficient restriction. This architectural oversight means that while an attacker must first possess valid credentials and a logged-in session on the target machine, they do not need administrative rights to exploit this specific weakness. The flaw effectively bypasses the principle of least privilege by granting standard users capabilities intended for system-level processes or administrators, thereby creating a pathway for unauthorized information disclosure.
From a technical perspective, the vulnerability stems from misconfigured Discretionary Access Control Lists on key registry keys and service endpoints associated with telemetry collection mechanisms. An authorized attacker can leverage these overly broad permissions to query sensitive diagnostic data that is not intended for general user consumption. This data often includes detailed system configuration details, installed software inventories, hardware identifiers, and potentially behavioral patterns of other users or the system administrator. By manipulating the telemetry settings or querying internal states through exposed interfaces, an attacker can extract information that reveals the security posture of the network, including patch levels, specific application versions with known vulnerabilities, and unique machine fingerprints. This capability transforms a standard user account into a reconnaissance tool, allowing for detailed mapping of the target environment without triggering typical high-level alerting mechanisms associated with administrative actions.
The operational impact of this vulnerability is primarily centered on information disclosure and subsequent lateral movement facilitation. Although the immediate effect is local data exfiltration, the intelligence gathered can be highly valuable to an attacker planning further attacks against a corporate network. Knowledge of specific software versions allows for targeted exploitation using known exploits that may not yet have patches deployed in all environments. Furthermore, understanding the telemetry configuration and enabled features helps attackers identify potential persistence mechanisms or communication channels they might abuse. The ability to read this data locally also aids in evading detection, as standard security monitoring tools often do not flag routine user-level interactions with diagnostic services as malicious activity. This makes the vulnerability particularly dangerous in environments where defense-in-depth strategies rely heavily on behavioral analysis and anomaly detection, as the attacker's actions appear consistent with normal system operation.
In alignment with industry standards, this flaw is categorized under CWE-269 Improper Privilege Management, specifically reflecting a failure to enforce appropriate access control levels for sensitive resources. It also maps closely to ATT&CK technique T1087 Account Discovery and potentially T1530 Data from Cloud or On-Premises Systems if the telemetry data involves cloud-synced configurations. The lack of granular permissions allows an attacker to perform enumeration tasks that should be restricted, undermining the integrity of the system's security model. Mitigation strategies primarily involve applying vendor-supplied patches that correct the access control lists for the affected components. Administrators are advised to ensure that all systems running vulnerable versions of Windows have received the latest cumulative updates which address these permission discrepancies. Additionally, implementing strict group policy configurations to restrict telemetry data collection and limiting user privileges where possible can reduce the attack surface. Regular auditing of service permissions and monitoring for unusual access patterns to diagnostic services can also help in detecting potential exploitation attempts before significant damage occurs.