Type Confusion in Microsoft Windows and Windows Server - CVE-2026-6726

Vulnerability identifier: #VU141874

CSH Severity: Low

CVSS v4: 8.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-6726

CWE-ID: CWE-843

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to spoof a trusted platform module identity.

The vulnerability exists due to access of resource using incompatible type in the TPM 2.0 reference implementation when reusing object slots. A local privileged user can trigger improper object-slot reuse to spoof a trusted platform module identity.

The issue affects the vTPM scenario.

Microsoft Windows
Windows Server

Install security update from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7663, 10 22H2 10.0.19045.7663, 10 1607 10.0.14393.9418, 10 1809 10.0.17763.9115, 11 23H2 10.0.22631.7517, 11 24H2 10.0.26100.9106, 11 24H2 10.0.26100.9168, 11 25H2 10.0.26200.9168, 11 26H1 10.0.28000.2704
Windows Server - addressed in versions 2019 10.0.17763.9115, 2022 10.0.20348.5440, 2022 10.0.20348.5499, 2025 10.0.26100.33222, 2025 10.0.26100.33296

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-6726

• Multiple vulnerabilities in Microsoft Windows