CVE-2026-59126 in Windows
Summary
by MITRE • 08/11/2026
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Event Logging Service allows an authorized attacker to elevate privileges locally.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 08/11/2026
A race condition vulnerability exists within the Windows Event Logging Service that enables authenticated attackers to achieve local privilege escalation through improper synchronization of shared resources during concurrent execution. This weakness resides in the event logging subsystem where multiple threads or processes access common resources without adequate protective mechanisms, creating opportunities for malicious code injection and privilege manipulation.
The technical flaw manifests when the event logging service handles concurrent operations involving shared memory segments or file handles without proper locking mechanisms or atomic operations. When multiple processes attempt to write to or modify event log entries simultaneously, the absence of coordinated synchronization allows an attacker to manipulate the timing and sequence of these operations to inject malicious content or alter existing entries. This vulnerability specifically affects the Windows Event Logging Service component that manages system event records and their associated metadata.
The operational impact of this race condition is significant for local privilege escalation attacks, as authenticated users can exploit the flaw to elevate their privileges from standard user level to SYSTEM level access. Attackers typically leverage this weakness by creating race conditions during log entry creation or modification processes, potentially injecting malicious code into event logs that gets executed with elevated privileges. The vulnerability is particularly dangerous because it requires only local authentication and does not necessitate network connectivity or remote exploitation capabilities.
This type of vulnerability maps directly to CWE-362, which specifically addresses race conditions in concurrent programming where improper synchronization leads to security flaws. From an ATT&CK framework perspective, this represents a privilege escalation technique under T1068, where adversaries leverage software vulnerabilities to gain elevated privileges. The attack vector aligns with T1547.001, representing registry run keys and startup folder modifications that can be exploited through event logging manipulation.
Mitigation strategies should focus on implementing proper synchronization mechanisms within the event logging service, including mutex locks, semaphore operations, or atomic read-modify-write operations to prevent concurrent access conflicts. Microsoft has addressed this vulnerability through security updates that enforce proper resource locking during event log operations and enhanced validation of log entry modifications. System administrators should ensure timely patch deployment and implement monitoring solutions to detect anomalous event logging activities that might indicate exploitation attempts. Additionally, privilege separation and least-privilege principles should be enforced to limit the potential impact of any successful exploitation attempts within the system.