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CVE-2026-20806

MediumCVSS 5.5/10Last modified Oct 26, 2026

Description

Access of resource using incompatible type ('type confusion') in Windows COM allows an authorized attacker to disclose information locally.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows 10 Version 1809	>= 10.0.17763.0, < 10.0.17763.8644
Microsoft	Windows 10 Version 21H2	>= 10.0.19044.0, < 10.0.19044.7184
Microsoft	Windows 10 Version 22H2	>= 10.0.19045.0, < 10.0.19045.7184
Microsoft	Windows 11 version 23H2	>= 10.0.22631.0, < 10.0.22631.6936
Microsoft	Windows 11 Version 23H2	>= 10.0.22631.0, < 10.0.22631.6936
Microsoft	Windows 11 Version 24H2	>= 10.0.26100.0, < 10.0.26100.8246
Microsoft	Windows 11 Version 25H2	>= 10.0.26200.0, < 10.0.26200.8246
Microsoft	Windows 11 version 26H1	>= 10.0.28000.0, < 10.0.28000.1836
Microsoft	Windows Server 2019	>= 10.0.17763.0, < 10.0.17763.8644
Microsoft	Windows Server 2019 (Server Core installation)	>= 10.0.17763.0, < 10.0.17763.8644
Microsoft	Windows Server 2022	>= 10.0.20348.0, < 10.0.20348.5020
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	>= 10.0.25398.0, < 10.0.25398.2274
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.32690
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.32690

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20806Vendor Advisory

Timeline

Published: Apr 14, 2026
Last modified: Oct 26, 2026
NVD status: Analyzed

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CVE-2026-20806: Medium severity, CVSS 5.5 | Vulnix