Executive Risk Summary
"A time-of-check time-of-use (toctou) race condition in Windows HTTP.sys allows an authorized attacker to elevate privileges locally, potentially leading to unauthorized access to sensitive data and system resources. This vulnerability can be exploited by an attacker with local access to the system, and successful exploitation could result in a significant security breach."
Operational Audit Arsenal
Target Type Driver
Target Asset http.sys
Standard Path %windir%\System32\drivers
PowerShell
# 🛠️ Senior Engineer Universal Audit
# Target: http.sys (Driver)
$Targets = 'http.sys'
$SearchPaths = @("$env:windir\System32", "$env:ProgramFiles", "${env:ProgramFiles(x86)}")
Get-ChildItem -Path $SearchPaths -Include $Targets -Recurse -ErrorAction SilentlyContinue |
Select-Object FullName, @{Name="Version";Expression={$_.VersionInfo.ProductVersion}}Patch Impact Forecast
Reboot Required Likely
Web services and applications using HTTP.sys may be affected
Internal Work Notes
CVE-2026-21240: Local privilege escalation vulnerability in Windows HTTP.sys, requiring immediate patching to prevent potential security breaches.
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Intelligence Sources
Related Microsoft Threats
Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.