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CVE-2026-20869

Windows Local Session Manager (LSM) Elevation of Privilege Vulnerability

Published: Jan 13, 2026Updated: Jan 15, 2026 Sources: CVE List NVD BDUCWE-362
7.0HIGH
NVD MITRE
EPSS Score
0.3%
Top 79.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:HPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-362

Affected Products

Microsoft Corp
commercial·USaka Microsoft, microsoft corporation
Windows 10 Version 1607On-premOS
Operating Systems / windows
Windows 11 version 22H3On-premOS
Operating Systems / windows
Windows Server 2008 R2 Service Pack 1 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2008 Service Pack 2 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2012 R2 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2016 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
and 54 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-20869?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20869
msrc.microsoft.com
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20869
msrc.microsoft.com
https://www.cybersecurity-help.cz/vulnerabilities/121405/
cybersecurity-help.cz
News mentions
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