CVE-2026-20869
Unknown Unknown - Not Provided
Race Condition in Windows LSM Enables Local Privilege Escalation

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Local Session Manager (LSM) allows an authorized attacker to elevate privileges locally.
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Meta Information
Published
2026-01-13
Last Modified
2026-01-13
Generated
2026-06-16
AI Q&A
2026-01-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20869
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_local_session_manager *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
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Impact Analysis

An attacker who already has some level of authorization on the system can exploit this vulnerability to gain higher privileges than intended. This elevation of privilege can lead to unauthorized actions, potentially compromising system security and integrity. [1]

Executive Summary

This vulnerability is a race condition in the Windows Local Session Manager (LSM) where concurrent execution using a shared resource lacks proper synchronization. This flaw allows an authorized attacker to elevate their privileges locally on the affected system. [1]

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