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7.8

Windows 10/11 can let attackers gain admin rights

CVE-2026-83942 · published 1 month ago
Summary

Certain versions of Windows 10 (1809, 21H2, 22H2) and Windows 11 (23H2, 24H2) contain a coding error that lets someone with limited access run code as an administrator on the same computer. This could let a malicious user take control of the system or install additional software. Apply the latest Microsoft security updates as soon as they are available to fix the issue.

What to do
  • Update microsoft windows 10 version 1809 to version 10.0.17763.9245 or later.
  • Update microsoft windows 10 version 21h2 to version 10.0.19044.7725 or later.
  • Update microsoft windows 10 version 22h2 to version 10.0.19045.7725 or later.
  • Update microsoft windows 11 version 23h2 to version 10.0.22631.7582 or later.
  • Update microsoft windows 11 version 24h2 to version 10.0.26100.9445 or later.
  • Update microsoft windows 11 version 25h2 to version 10.0.26200.9445 or later.
  • Update microsoft windows 11 version 26h1 to version 10.0.28000.2954 or later.
  • Update microsoft windows server 2019 to version 10.0.17763.9245 or later.
  • Update microsoft windows server 2019 (server core installation) to version 10.0.17763.9245 or later.
  • Update microsoft windows server 2022 to version 10.0.20348.5622 or later.
  • Update microsoft windows server 2025 to version 10.0.26100.33438 or later.
  • Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33438 or later.
  • Update microsoft windows_10_1809 to version 10.0.17763.9245 or later.
  • Update microsoft windows_10_21h2 to version 10.0.19044.7725 or later.
  • Update microsoft windows_10_22h2 to version 10.0.19045.7725 or later.
  • Update microsoft windows_11_23h2 to version 10.0.22631.7582 or later.
  • Update microsoft windows_11_24h2 to version 10.0.26100.9445 or later.
  • Update microsoft windows_11_25h2 to version 10.0.26200.9445 or later.
  • Update microsoft windows_11_26h1 to version 10.0.28000.2954 or later.
  • Update microsoft windows_server_2019 to version 10.0.17763.9245 or later.
  • Update microsoft windows_server_2022 to version 10.0.20348.5622 or later.
  • Update microsoft windows_server_2025 to version 10.0.26100.33438 or later.
Affected software
VendorProductAffected versions
microsoft windows 10 version 1809 < 10.0.17763.9245
microsoft windows 10 version 21h2 < 10.0.19044.7725
microsoft windows 10 version 22h2 < 10.0.19045.7725
microsoft windows 11 version 23h2 < 10.0.22631.7582
microsoft windows 11 version 24h2 < 10.0.26100.9445
microsoft windows 11 version 25h2 < 10.0.26200.9445
microsoft windows 11 version 26h1 < 10.0.28000.2954
microsoft windows server 2019 < 10.0.17763.9245
microsoft windows server 2019 (server core installation) < 10.0.17763.9245
microsoft windows server 2022 < 10.0.20348.5622
microsoft windows server 2025 < 10.0.26100.33438
microsoft windows server 2025 (server core installation) < 10.0.26100.33438
microsoft windows_10_1809 < 10.0.17763.9245
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
microsoft windows_10_21h2 < 10.0.19044.7725
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
microsoft windows_10_22h2 < 10.0.19045.7725
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_23h2 < 10.0.22631.7582
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_24h2 < 10.0.26100.9445
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_25h2 < 10.0.26200.9445
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_26h1 < 10.0.28000.2954
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
microsoft windows_server_2019 < 10.0.17763.9245
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
microsoft windows_server_2022 < 10.0.20348.5622
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
microsoft windows_server_2025 < 10.0.26100.33438
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Original advisory text
Windows Kernel Elevation of Privilege Vulnerability
Missing authorization in Windows Kernel allows an authorized attacker to elevate privileges locally.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
7.8 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-862Missing Authorization
Timeline
Published8 Sep 2026
Updated4 Nov 2026
First seen8 Sep 2026
Sources
CVE-2026-83942 · NVD
CVE-2026-83942 · MITRE
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