CVE-2026-20806: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Windows 10 Version 1809
Access of resource using incompatible type ('type confusion') in Windows COM allows an authorized attacker to disclose information locally.
AI Analysis
Technical Summary
This vulnerability involves a type confusion flaw (CWE-843) in the Windows Component Object Model (COM) on Windows 10 Version 1809 (build 10.0.17763.0). It permits an authorized attacker with local access and low privileges to disclose sensitive information by accessing a resource using an incompatible type. The vulnerability does not require user interaction and does not affect system integrity or availability. Microsoft has published an official fix to address this issue.
Potential Impact
The vulnerability allows local attackers with limited privileges to disclose sensitive information on affected Windows 10 Version 1809 systems. It does not impact system integrity or availability, and no remote exploitation or user interaction is required.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20806 to remediate this vulnerability.
CVE-2026-20806: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in Microsoft Windows 10 Version 1809
Description
Access of resource using incompatible type ('type confusion') in Windows COM allows an authorized attacker to disclose information locally.
CVSS v3.1
Score 5.5medium
Affected software
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 22H3
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2022, 23H2 Edition (Server Core installation)
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a type confusion flaw (CWE-843) in the Windows Component Object Model (COM) on Windows 10 Version 1809 (build 10.0.17763.0). It permits an authorized attacker with local access and low privileges to disclose sensitive information by accessing a resource using an incompatible type. The vulnerability does not require user interaction and does not affect system integrity or availability. Microsoft has published an official fix to address this issue.
Potential Impact
The vulnerability allows local attackers with limited privileges to disclose sensitive information on affected Windows 10 Version 1809 systems. It does not impact system integrity or availability, and no remote exploitation or user interaction is required.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20806 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-03T05:54:20.371Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20806","vendor":"Microsoft"}]
Threat ID: 69de7a1482d89c981fd6a5e0
Added to database: 04/14/2026, 17:32:04 UTC
Last enriched: 08/15/2026, 13:53:31 UTC
Last updated: 09/13/2026, 10:01:29 UTC
Views: 117
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