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7.8

Windows 10/11 let local attackers gain admin rights

CVE-2026-83913 · published 22 days ago
Summary

The recent Windows Kernel flaw affects Windows 10 versions 21H2 and 22H2, and Windows 11 versions 23H2, 24H2, and 25H2. It could allow someone with limited access on a computer to increase their privileges to full administrator level. Apply the latest Windows updates as soon as they are available to fix the issue.

What to do
  • Update microsoft windows 10 version 21h2 to version 10.0.19044.7807 or later.
  • Update microsoft windows 11 version 23h2 to version 10.0.22631.7652 or later.
  • Update microsoft windows 11 version 24h2 to version 10.0.26100.9711 or later.
  • Update microsoft windows 11 version 25h2 to version 10.0.26200.9711 or later.
  • Update microsoft windows 11 version 26h1 to version 10.0.28000.3231 or later.
  • Update microsoft windows 11 version 26h2 to version 10.0.26300.9711 or later.
  • Update microsoft windows server 2022 to version 10.0.20348.5761 or later.
  • Update microsoft windows server 2025 to version 10.0.26100.33650 or later.
  • Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33650 or later.
  • Update microsoft windows_10_21h2 to version 10.0.19044.7807 or later.
  • Update microsoft windows_10_22h2 to version 10.0.19045.7807 or later.
  • Update microsoft windows_11_23h2 to version 10.0.22631.7652 or later.
  • Update microsoft windows_11_24h2 to version 10.0.26100.9711 or later.
  • Update microsoft windows_11_25h2 to version 10.0.26200.9711 or later.
  • Update microsoft windows_11_26h1 to version 10.0.28000.3231 or later.
  • Update microsoft windows_11_26h2 to version 10.0.26300.9711 or later.
  • Update microsoft windows_server_2022 to version 10.0.20348.5761 or later.
  • Update microsoft windows_server_2025 to version 10.0.26100.33650 or later.
Affected software
VendorProductAffected versions
microsoft windows 10 version 21h2 < 10.0.19044.7807
microsoft windows 10 version 22h2 < 10.0.19044.7807
< 10.0.19045.7807
microsoft windows 11 version 23h2 < 10.0.22631.7652
microsoft windows 11 version 24h2 < 10.0.26100.9711
microsoft windows 11 version 25h2 < 10.0.26200.9711
microsoft windows 11 version 26h1 < 10.0.28000.3231
microsoft windows 11 version 26h2 < 10.0.26300.9711
microsoft windows server 2022 < 10.0.20348.5761
microsoft windows server 2025 < 10.0.26100.33650
microsoft windows server 2025 (server core installation) < 10.0.26100.33650
microsoft windows_10_21h2 < 10.0.19044.7807
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
microsoft windows_10_22h2 < 10.0.19045.7807
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_23h2 < 10.0.22631.7652
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_24h2 < 10.0.26100.9711
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_25h2 < 10.0.26200.9711
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
microsoft windows_11_26h1 < 10.0.28000.3231
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
microsoft windows_11_26h2 < 10.0.26300.9711
cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:arm64:*
microsoft windows_server_2022 < 10.0.20348.5761
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*
microsoft windows_server_2025 < 10.0.26100.33650
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*
Original advisory text
Windows Kernel Elevation of Privilege Vulnerability
Use after free 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-416Use After Free
Timeline
Published13 Oct 2026
Updated4 Nov 2026
First seen13 Oct 2026
Sources
CVE-2026-83913 · NVD
CVE-2026-83913 · MITRE
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