Elevation of Privilege Vulnerability in Microsoft Windows HTTP.sys
CVE-2026-21232

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows 11 Version 26h1
Windows 11 Version 26h1
Windows Server 2025 (server Core Installation)
Windows 11 Version 25h2
Vendor
CVE Published:
10 February 2026

What is CVE-2026-21232?

An untrusted pointer dereference vulnerability in Windows HTTP.sys permits an authorized attacker to elevate their privileges locally. By exploiting this flaw, attackers can gain access to system-level functionalities that should be restricted. The vulnerability affects various versions of Windows, highlighting the importance of immediate updates and security practices to mitigate potential threats.

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Affected Version(s)

Windows 11 version 22H3 ARM64-based Systems 10.0.22631.0 < 10.0.22631.6649

Windows 11 Version 23H2 x64-based Systems 10.0.22631.0 < 10.0.22631.6649

Windows 11 Version 24H2 ARM64-based Systems 10.0.26100.0 < 10.0.26100.7840

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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