CVE-2026-20869

HIGH

Windows Local Session Manager - Privilege Escalation

Title source: llm

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.

References (1)

[Vendor Advisory] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20869

Scores

CVSS v3 7.0

EPSS 0.0003

EPSS Percentile 6.4%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Classification

CWE

CWE-362

Status published

Affected Products (19)

microsoft/windows_10_1607 < 10.0.14393.8783

microsoft/windows_10_1809 < 10.0.17763.8276

microsoft/windows_10_21h2 < 10.0.19044.6809

microsoft/windows_10_22h2 < 10.0.19045.6809

microsoft/windows_11_23h2 < 10.0.22631.6491

microsoft/windows_11_24h2 < 10.0.26100.7623

microsoft/windows_11_25h2 < 10.0.26200.7623

microsoft/windows_server_2008

microsoft/windows_server_2012

microsoft/windows_server_2016 < 10.0.14393.8783

... and 4 more

Timeline

Published Jan 13, 2026

Tracked Since Feb 18, 2026