CVE-2026-47656: Windows Boot Manager Security Feature Bypass Vulnerability

Overview

Severity

High (CVSS 7.9)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C

Category

Security Feature Bypass

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Jun

Released

2026-06-09

Description

Protection mechanism failure in Windows Boot Manager allows an authorized attacker to bypass a security feature locally.

FAQ

What kind of security feature could be bypassed by successfully exploiting this vulnerability? An attacker who successfully exploited this vulnerability could bypass Secure Boot. According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability? A scope change means that successfully exploiting this vulnerability could allow an attacker to affect security protections beyond the original vulnerable component. In this case, the issue could enable a bypass of Secure Boot and exposure of Virtual Secure Mode (VSM) secrets, impacting a more highly protected security boundary rather than being limited to the initially affected boot component.

Affected Products (30)

Windows

• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows Server 2022 (Server Core installation)
• Windows 10 Version 21H2 for 32-bit Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 24H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows Server 2025
• Windows 11 version 26H1 for x64-based Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows Server 2016
• Windows Server 2016 (Server Core installation)
• Windows 10 Version 1607 for x64-based Systems

ESU

• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for 32-bit Systems
• Windows Server 2012 (Server Core installation)
• Windows Server 2012 R2 (Server Core installation)
• Windows Server 2012
• Windows Server 2012 R2

Security Updates (10)

• 5094123
• 5094128
• 5094127
• 5094125
• 5094126
• 5093998
• 5095051
• 5094122
• 5094042
• 5094041

Acknowledgments

Microsoft

Revision History

• 2026-06-09: Information published.