OTPulse

Windows Win32k Elevation of Privilege Vulnerability

Plan PatchCVSS 7.8CVE-2026-54114Jul 14, 2026
Microsoft
IT in OT - Windows Server and Active Directory are widely deployed in OT environments
Attack path
Attack VectorLocal
Auth RequiredLow
ComplexityLow
User InteractionNone needed
Summary

A use-after-free vulnerability in Windows Win32k allows a user with standard local account privileges to elevate to administrative (SYSTEM) level through exploitation of memory management flaws. This affects Windows 10 (all versions), Windows 11 (all versions), and Windows Server 2019, 2022, and 2025. Microsoft rates exploitation likelihood as "more likely" and has released patches in the July 2026 security update.

What this means
What could happen
A user with a standard local account on your Windows workstation or server could gain administrative privileges through a use-after-free flaw in the Win32k subsystem, potentially compromising the entire system and any connected OT networks.
Who's at risk
Windows workstations and servers across all supported versions (Windows 10, Windows 11, Windows Server 2019, 2022, 2025) used in your IT environment. This includes engineering workstations, administrative terminals, HMI servers, and any gateway machines that bridge corporate IT and OT networks.
How it could be exploited
An attacker with local access to a Windows machine (physical access or via remote desktop/file share) executes malicious code that triggers the use-after-free vulnerability in Win32k. The flaw allows the process to escape user-level restrictions and run commands with system-level privileges, gaining full control of the machine.
Prerequisites
  • Local user account on the target Windows machine (standard user privileges sufficient)
  • Ability to execute code locally (interactive logon, RDP session, or ability to run a malicious executable)
Locally exploitableLow complexity attackExploitation likely (Microsoft assessment)Affects system-level controlImpacts network access points to OT systems
Exploitability
Unlikely to be exploited — EPSS score 0.3%
Affected products (19)
19 with fix
ProductAffected VersionsFix Status
Windows 10 Version 1809 for 32-bit SystemsAll versionsBuild 10.0.17763.9020
Windows 10 Version 1809 for x64-based SystemsAll versionsBuild 10.0.17763.9020
Windows Server 2019All versionsBuild 10.0.17763.9020
Windows Server 2019 (Server Core installation)All versionsBuild 10.0.17763.9020
Windows Server 2022All versionsBuild 10.0.20348.5386
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDRestrict interactive logon and RDP access to Windows machines based on role and network segregation; limit remote desktop access to trusted administrative networks only
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HOTFIXApply the July 2026 Windows security update to all Windows 10, Windows 11, and Windows Server instances in your environment
HOTFIXPrioritize patching for any Windows machines used for remote access (engineering workstations, administrative terminals) if they have external connectivity
Long-term hardening
0/1
HARDENINGRequire multi-factor authentication for any remote access accounts on Windows machines, particularly those with elevated privileges
View full vendor advisory
API: /api/v1/advisories/3f15f66e-3493-4d30-9156-496bdf9470f9

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Windows Win32k Elevation of Privilege Vulnerability | CVSS 7.8 - OTPulse