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High7.8Microsoft Server

High [CVE-2026-65671] Remote Access API Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-65671 affecting Windows Server 2012 R2 (Server Core installation), Windows Server 2016 (Server Core installation), Windows Server 2019 (Server Core installation).

CVE-2026-65671 Published Aug 11, 2026Updated by vendor Aug 11, 2026
CVE-2026-65671
Affected products & platforms
Microsoft ServerWindows Server
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Summary

Heap-based buffer overflow in Windows Remote Access API allows an authorized attacker to elevate privileges locally.

Affected products named by the advisory: Windows Server 2012 R2; Windows Server 2012 R2 (Server Core installation); Windows Server 2016; Windows Server 2016 (Server Core installation); and 5 more.

Affected products named by the advisory: Windows Server 2019 (Server Core installation); Windows Server 2022; Windows Server 2025 (Server Core installation).

Affected versions
  • Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9418
  • Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.9115
  • Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7663
  • Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.7663
  • Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7517
  • Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7517
  • Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.9168
  • Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.9168
  • Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.2704
  • Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.23337
  • Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 before 6.3.9600.23337
  • Windows Server 2016 10.0.14393.0 before 10.0.14393.9418

Official advisory · high-confidence parse· fetched 1 hour ago·verify at source

Fixed versions
  • 10.0.14393.9418
  • 10.0.17763.9115
  • 10.0.19044.7663
  • 10.0.19045.7663
  • 10.0.22631.7517
  • 10.0.26100.9168
  • 10.0.26200.9168
  • 10.0.28000.2704
  • 6.3.9600.23337
  • 10.0.20348.5499
  • 10.0.26100.33296

Official advisory · high-confidence parse· fetched 1 hour ago·verify at source

Mitigation

Upgrade to a fixed release: 10.0.14393.9418, 10.0.17763.9115, 10.0.19044.7663, 10.0.19045.7663, 10.0.22631.7517, 10.0.26100.9168. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 1 hour ago·verify at source

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