CVE-2026-20811: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Windows 11 version 23H2
Access of resource using incompatible type ('type confusion') in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
CVE-2026-20811 is a vulnerability classified as CWE-843 (Access of Resource Using Incompatible Type, or type confusion) affecting the Windows Win32K ICOMP component in Windows 11 version 23H2 (build 10.0.22631.0). The flaw enables a local attacker with authorized access to escalate privileges by exploiting improper handling of resource types. Microsoft has published an official fix for this vulnerability, and no known exploits are reported in the wild as of the publication date.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to elevate their privileges on the affected Windows 11 system. This can lead to full system compromise, including complete control over the affected machine, impacting confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 11 version 23H2 to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20811 for detailed update instructions and confirmation of patch availability.
CVE-2026-20811: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Windows 11 version 23H2
Description
Access of resource using incompatible type ('type confusion') in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-20811 is a vulnerability classified as CWE-843 (Access of Resource Using Incompatible Type, or type confusion) affecting the Windows Win32K ICOMP component in Windows 11 version 23H2 (build 10.0.22631.0). The flaw enables a local attacker with authorized access to escalate privileges by exploiting improper handling of resource types. Microsoft has published an official fix for this vulnerability, and no known exploits are reported in the wild as of the publication date.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to elevate their privileges on the affected Windows 11 system. This can lead to full system compromise, including complete control over the affected machine, impacting confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 11 version 23H2 to remediate this vulnerability. Refer to the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20811 for detailed update instructions and confirmation of patch availability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.372Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20811","vendor":"Microsoft"}]
Threat ID: 69668adaa60475309f9adf4e
Added to database: 01/13/2026, 18:11:38 UTC
Last enriched: 07/30/2026, 23:50:19 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 187
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