Windows Kernel Elevation of Privilege Vulnerability
Plan PatchCVSS 7.8CVE-2026-33841May 12, 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 heap-based buffer overflow in the Windows Kernel allows an authorized user with local access to elevate their privileges on the system. The vulnerability requires local execution; remote exploitation is not possible.
What this means
What could happen
A user logged into a Windows system could exploit this to gain administrative access, potentially allowing them to modify control logic, disable monitoring systems, or disrupt normal operations on HMIs and engineering workstations.
Who's at risk
This affects any organization using Windows 10, Windows 11, or Windows Server 2022/2025 as HMI (human-machine interface) systems, engineering workstations, or data historian servers. Particularly critical for organizations where these workstations have privileged access to control systems or network connectivity to PLCs and safety systems.
How it could be exploited
An attacker with an active user account on the system executes specially crafted code that triggers the heap-based buffer overflow in the Windows Kernel, elevating their privileges from standard user to administrator or system level. This could then be used to modify sensitive settings on OT systems managed from that workstation.
Prerequisites
- Local user account on the affected Windows system
- Ability to execute code on the system
Low complexity attackLocal execution required (not remotely exploitable)Requires valid user credentialsAffects high-privilege administrative functions
Exploitability
Unlikely to be exploited — EPSS score 0.1%
Affected products (19)
19 with fix
ProductAffected VersionsFix Status
Remediation & Mitigation
0/4
Schedule — requires maintenance window
0/2Patching may require device reboot — plan for process interruption
HOTFIXApply the 2026-May Windows security update to all affected Windows systems (Windows 10, 11, and Server 2022/2025)
HOTFIXPrioritize patching Windows systems that serve as engineering workstations or HMI interfaces with access to control systems
Long-term hardening
0/2HARDENINGRestrict local administrative console access to Windows workstations to only authorized personnel
HARDENINGImplement application whitelisting or execution policy controls to restrict unauthorized code execution on engineering workstations
CVEs (1)
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