CVE-2026-20861
7.8Microsoft · Windows Management Services
A race condition in Windows Management Services allows an authenticated local attacker to achieve privilege escalation through improper synchronization of shared resources.
Executive summary
A race condition vulnerability in Microsoft Windows Management Services permits an authenticated local attacker to escalate privileges, resulting in a high-severity security risk.
Vulnerability
The flaw involves a race condition (CWE-362) within Windows Management Services, where improper synchronization of shared resources allows a locally authenticated user to manipulate system processes to gain elevated privileges.
Business impact
The exploitation of this vulnerability leads to a total loss of confidentiality, integrity, and availability on the affected host. With a CVSS score of 7.8, this flaw represents a significant risk, as it enables an attacker who has already gained low-level access to compromise the entire operating system, potentially leading to unauthorized data access and persistence within the environment.
Remediation
Immediate Action: Apply the relevant security updates provided in the Microsoft Security Update Guide for the specific Windows version and build installed.
Proactive Monitoring: Monitor system logs for unexpected privilege escalation events, abnormal process spawning, or unusual activity associated with Windows management components.
Compensating Controls: Enforce the principle of least privilege to ensure that local users cannot execute unauthorized code, and utilize endpoint detection and response tools to identify anomalous behavior patterns.
Exploitation status
Public Exploit Available: No (exploit_available: false)
Analyst recommendation
Given the potential for total system compromise, administrators should prioritize the deployment of the vendor patches across all affected Windows endpoints. Ensuring that systems are updated to the specified builds will effectively neutralize the race condition and prevent local privilege escalation.
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Sources
- Windows Management Services Elevation of Privilege Vulnerability Vendor advisory