HarborGuard / CVE
Back to search
HIGHCVE-2026-20869Published Modified CNA microsoft

CVE-2026-20869: Windows Local Session Manager (LSM) Elevation of Privilege Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Local Session Manager (LSM) allows an authorized attacker to elevate privileges locally.

Metrics

CVSS v3.1
7.0
Severity
HIGH
Fixed in
6.0.6003.23717
Affected Products
24

Fix available

6.0.6003.237176.1.7601.281176.2.9200.258686.3.9600.2296810.0.14393.878310.0.17763.827610.0.19044.680910.0.19045.680910.0.20348.464810.0.22631.649110.0.25398.209210.0.26100.762310.0.26100.3223010.0.26200.7623
Patch commits
Affected packages
  • Microsoft / Windows 10 Version 1607
    < 10.0.14393.8783 (from 10.0.14393.0)
  • Microsoft / Windows 10 Version 1809
    < 10.0.17763.8276 (from 10.0.17763.0)
  • Microsoft / Windows 10 Version 21H2
    < 10.0.19044.6809 (from 10.0.19044.0)
  • Microsoft / Windows 10 Version 22H2
    < 10.0.19045.6809 (from 10.0.19045.0)
  • Microsoft / Windows 11 version 22H3
    < 10.0.22631.6491 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 23H2
    < 10.0.22631.6491 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 24H2
    < 10.0.26100.7623 (from 10.0.26100.0)
  • Microsoft / Windows 11 Version 25H2
    < 10.0.26200.7623 (from 10.0.26200.0)
  • Microsoft / Windows Server 2008 R2 Service Pack 1
    < 6.1.7601.28117 (from 6.1.7601.0)
  • Microsoft / Windows Server 2008 R2 Service Pack 1 (Server Core installation)
    < 6.1.7601.28117 (from 6.1.7601.0)
  • Microsoft / Windows Server 2008 Service Pack 2
    < 6.0.6003.23717 (from 6.0.6003.0)
  • Microsoft / Windows Server 2008 Service Pack 2 (Server Core installation)
    < 6.0.6003.23717 (from 6.0.6003.0)
  • Microsoft / Windows Server 2012
    < 6.2.9200.25868 (from 6.2.9200.0)
  • Microsoft / Windows Server 2012 (Server Core installation)
    < 6.2.9200.25868 (from 6.2.9200.0)
  • Microsoft / Windows Server 2012 R2
    < 6.3.9600.22968 (from 6.3.9600.0)
  • Microsoft / Windows Server 2012 R2 (Server Core installation)
    < 6.3.9600.22968 (from 6.3.9600.0)
  • Microsoft / Windows Server 2016
    < 10.0.14393.8783 (from 10.0.14393.0)
  • Microsoft / Windows Server 2016 (Server Core installation)
    < 10.0.14393.8783 (from 10.0.14393.0)
  • Microsoft / Windows Server 2019
    < 10.0.17763.8276 (from 10.0.17763.0)
  • Microsoft / Windows Server 2019 (Server Core installation)
    < 10.0.17763.8276 (from 10.0.17763.0)
  • Microsoft / Windows Server 2022
    < 10.0.20348.4648 (from 10.0.20348.0)
  • Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)
    < 10.0.25398.2092 (from 10.0.25398.0)
  • Microsoft / Windows Server 2025
    < 10.0.26100.32230 (from 10.0.26100.0)
  • Microsoft / Windows Server 2025 (Server Core installation)
    < 10.0.26100.32230 (from 10.0.26100.0)
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
CVE-2026-20869: Windows Local Session Manager (LSM) Elevation of Privilege Vulnerability | HarborGuard CVE