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CVE-2026-20869

Windows Local Session Manager (LSM) Elevation of Privilege Vulnerability

HIGH
7
CVSS Score
Published: January 13, 2026 at 05:56 PM UTC
Updated: July 30, 2026 at 09:29 PM UTC
15 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows Server 2012

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Severity
HIGH7
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10 1607· Microsoft
95%
v < 10.0.14393.878310.0.14393.0 ≤ v < 10.0.14393.878310.0.14393.0
Affected range stops below 10.0.14393.8783, so it looks safe — our inference, not a vendor statement
Windows 10 1809· Microsoft
95%
v < 10.0.17763.827610.0.17763.0 ≤ v < 10.0.17763.827610.0.17763.0
Affected range stops below 10.0.17763.8276, so it looks safe — our inference, not a vendor statement
Windows 10 21H2· Microsoft
95%
v < 10.0.19044.680910.0.19044.0 ≤ v < 10.0.19044.680910.0.19044.0
Affected range stops below 10.0.19044.6809, so it looks safe — our inference, not a vendor statement
Windows 10 22H2· Microsoft
95%
v < 10.0.19045.680910.0.19045.0 ≤ v < 10.0.19045.680910.0.19045.0
Affected range stops below 10.0.19045.6809, so it looks safe — our inference, not a vendor statement
Windows 11 23H2· Microsoft
95%
v < 10.0.22631.649110.0.22631.0 ≤ v < 10.0.22631.649110.0.22631.0
Affected range stops below 10.0.22631.6491, so it looks safe — our inference, not a vendor statement
Windows 11 24H2· Microsoft
95%
v < 10.0.26100.762310.0.26100.0 ≤ v < 10.0.26100.762310.0.26100.0
Affected range stops below 10.0.26100.7623, so it looks safe — our inference, not a vendor statement
Windows 11 25H2· Microsoft
95%
v < 10.0.26200.762310.0.26200.0 ≤ v < 10.0.26200.762310.0.26200.0
Affected range stops below 10.0.26200.7623, so it looks safe — our inference, not a vendor statement
Windows Server 2008· Microsoft
95%
6.0.6003.0 ≤ v < 6.0.6003.237176.1.7601.0 ≤ v < 6.1.7601.281176.0.6003.06.1.7601.0r2 sp1sp2
Affected range stops below 6.0.6003.23717, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.7601.28117, so it looks safe — our inference, not a vendor statement
Windows Server 2012· Microsoft
95%
6.2.9200.0 ≤ v < 6.2.9200.258686.3.9600.0 ≤ v < 6.3.9600.229686.2.9200.06.3.9600.0r2
Affected range stops below 6.2.9200.25868, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.3.9600.22968, so it looks safe — our inference, not a vendor statement
Windows Server 2016· Microsoft
95%
v < 10.0.14393.878310.0.14393.0 ≤ v < 10.0.14393.878310.0.14393.0
Affected range stops below 10.0.14393.8783, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20869

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-362

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