CVE-2026-48578 - Vulnerability Details

- Secure Boot Security Feature Bypass Vulnerability

Description

Improper access control in Windows Secure Boot allows an authorized attacker to elevate privileges locally.

Published: 2026-06-09

Score: 7.9 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

Improper access control in Windows Secure Boot allows an authorized attacker to elevate privileges locally.

Affected Systems

Affected systems include Microsoft Windows 10 versions 1607, 1809, 21H2, and 22H2; Microsoft Windows 11 versions 23H2, 24H2, 25H2, and 26H1; and Microsoft Windows Server releases 2012, 2012 R2, 2016, 2019, 2022, and 2025 (both core and full installations).

Risk and Exploitability

With a CVSS score of 7.9, the vulnerability is considered high severity. The EPSS score is very low (<1%), indicating a low likelihood of exploitation; however, threat compared to remote exploits. The vulnerability is not listed in the CISA KEV catalog, indicating no widely known commercial exploitation at present.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Microsoft

Windows 10 Version 1607

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9234

Microsoft

Windows 10 Version 1809

affected

Version	Status	Constraints
`10.0.17763.0`	affected	< 10.0.17763.8880

Microsoft

Windows 10 Version 21H2

affected

Version	Status	Constraints
`10.0.19044.0`	affected	< 10.0.19044.7417

Microsoft

Windows 10 Version 22H2

affected

Version	Status	Constraints
`10.0.19045.0`	affected	< 10.0.19045.7417

Microsoft

Windows 11 version 23H2

affected

Version	Status	Constraints
`10.0.22631.0`	affected	< 10.0.22631.7219

Microsoft

Windows 11 Version 23H2

affected

Version	Status	Constraints
`10.0.22631.0`	affected	< 10.0.22631.7219

Microsoft

Windows 11 Version 24H2

affected

Version	Status	Constraints
`10.0.26100.0`	affected	< 10.0.26100.8655

Microsoft

Windows 11 Version 25H2

affected

Version	Status	Constraints
`10.0.26200.0`	affected	< 10.0.26200.8655

Microsoft

Windows 11 version 26H1

affected

Version	Status	Constraints
`10.0.28000.0`	affected	< 10.0.28000.2269

Microsoft

Windows Server 2012

affected

Version	Status	Constraints
`6.2.9200.0`	affected	< 6.2.9200.26132

Microsoft

Windows Server 2012 (Server Core installation)

affected

Version	Status	Constraints
`6.2.9200.0`	affected	< 6.2.9200.26132

Microsoft

Windows Server 2012 R2

affected

Version	Status	Constraints
`6.3.9600.0`	affected	< 6.3.9600.23228

Microsoft

Windows Server 2012 R2 (Server Core installation)

affected

Version	Status	Constraints
`6.3.9600.0`	affected	< 6.3.9600.23228

Microsoft

Windows Server 2016

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9234

Microsoft

Windows Server 2016 (Server Core installation)

affected

Version	Status	Constraints
`10.0.14393.0`	affected	< 10.0.14393.9234

Microsoft

Windows Server 2019

affected

Version	Status	Constraints
`10.0.17763.0`	affected	< 10.0.17763.8880

Microsoft

Windows Server 2019 (Server Core installation)

affected

Version	Status	Constraints
`10.0.17763.0`	affected	< 10.0.17763.8880

Microsoft

Windows Server 2022

affected

Version	Status	Constraints
`10.0.20348.0`	affected	< 10.0.20348.5256

Microsoft

Windows Server 2025

affected

Version	Status	Constraints
`10.0.26100.0`	affected	< 10.0.26100.32995

Microsoft

Windows Server 2025 (Server Core installation)

affected

Version	Status	Constraints
`10.0.26100.0`	affected	< 10.0.26100.32995

Configuration 1 [-]

OR	cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_1607:::::::x86:*
	cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_1809:::::::x86:*
	cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_10_21h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_21h2:::::::x86:*
	cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_10_22h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_10_22h2:::::::x86:*
	cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_23h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:*
	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
	cpe:2.3:o:microsoft:windows_server_2016::::::::
	cpe:2.3:o:microsoft:windows_server_2019::::::::
	cpe:2.3:o:microsoft:windows_server_2022::::::::
	cpe:2.3:o:microsoft:windows_server_2025:::::::x64:*

No data.

Vendor Product Confidence Versions

Microsoft

Windows 10 1607

86%

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9234)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Windows 10 1809

86%

Version	Status	Scheme	Platform
`[10.0.17763.0,10.0.17763.8880)`	affected	generic	['32-bit_systems', 'x64-based_systems']

Microsoft

Windows 10 21h2

86%

Version	Status	Scheme	Platform
`[10.0.19044.0,10.0.19044.7417)`	affected	generic	['32-bit_systems', 'arm64-based_systems', 'x64-based_systems']

Microsoft

Windows 10 22h2

86%

Version	Status	Scheme	Platform
`[10.0.19045.0,10.0.19045.7417)`	affected	generic	['32-bit_systems', 'arm64-based_systems', 'x64-based_systems']

Microsoft

Windows 11 23h2

86%

Version	Status	Scheme	Platform
`[10.0.22631.0,10.0.22631.7219)`	affected	generic	['arm64-based_systems']

Microsoft

Windows 11 23h2

86%

Version	Status	Scheme	Platform
`[10.0.22631.0,10.0.22631.7219)`	affected	generic	['x64-based_systems']

Microsoft

Windows 11 24h2

86%

Version	Status	Scheme	Platform
`[10.0.26100.0,10.0.26100.8655)`	affected	generic	['arm64-based_systems', 'x64-based_systems']

Microsoft

Windows 11 25h2

86%

Version	Status	Scheme	Platform
`[10.0.26200.0,10.0.26200.8655)`	affected	generic	['arm64-based_systems', 'x64-based_systems']

Microsoft

Windows 11 26h1

86%

Version	Status	Scheme	Platform
`[10.0.28000.0,10.0.28000.2269)`	affected	generic	['arm64-based_systems', 'x64-based_systems']

Microsoft

Windows Server 2012

100%

Version	Status	Scheme	Platform
`[6.2.9200.0,6.2.9200.26132)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[6.2.9200.0,6.2.9200.26132)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 R2

100%

Version	Status	Scheme	Platform
`[6.3.9600.0,6.3.9600.23228)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2012 R2 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[6.3.9600.0,6.3.9600.23228)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2016

100%

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9234)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2016 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[10.0.14393.0,10.0.14393.9234)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2019

100%

Version	Status	Scheme	Platform
`[10.0.17763.0,10.0.17763.8880)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2019 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[10.0.17763.0,10.0.17763.8880)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2022

100%

Version	Status	Scheme	Platform
`[10.0.20348.0,10.0.20348.5256)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2025

100%

Version	Status	Scheme	Platform
`[10.0.26100.0,10.0.26100.32995)`	affected	generic	['x64-based_systems']

Microsoft

Windows Server 2025 (server Core Installation)

100%

Version	Status	Scheme	Platform
`[10.0.26100.0,10.0.26100.32995)`	affected	generic	['x64-based_systems']

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Apply the Microsoft patch that addresses CVE‑2026‑48578 via Windows Update or the Microsoft Update Catalog
Ensure that Secure Boot remains enabled in the system firmware to enforce code integrity for future boot loadings
Limit local administrative privileges so that only trusted users can modify boot components, applying least‑privilege principles

Generated by OpenCVE AI on August 2, 2026 at 01:55 UTC.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00268.

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48578

History

Wed, 08 Jul 2026 23:30:00 +0000

Type	Values Removed	Values Added
Description	Protection mechanism failure in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.	Improper access control in Windows Secure Boot allows an authorized attacker to elevate privileges locally.

Wed, 10 Jun 2026 15:15:00 +0000

Type	Values Removed	Values Added
CPEs		cpe:2.3:o:microsoft:windows_10_1607:::::::x64:* cpe:2.3:o:microsoft:windows_10_1809:::::::x64:* cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:* cpe:2.3:o:microsoft:windows_10_21h2:::::::x64:* cpe:2.3:o:microsoft:windows_10_21h2:::::::x86:* cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:* cpe:2.3:o:microsoft:windows_10_22h2:::::::x64:* cpe:2.3:o:microsoft:windows_10_22h2:::::::x86:* cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_23h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:* cpe:2.3:o:microsoft:windows_server_2012:-:::::::* cpe:2.3:o:microsoft:windows_server_2012:r2:::::::* cpe:2.3:o:microsoft:windows_server_2025:::::::x64:*

Wed, 10 Jun 2026 11:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows Server 2012 (server Core Installation) Microsoft windows Server 2012 R2 Microsoft windows Server 2012 R2 (server Core Installation) Microsoft windows Server 2016 (server Core Installation) Microsoft windows Server 2019 (server Core Installation) Microsoft windows Server 2025 (server Core Installation)
Vendors & Products		Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows Server 2012 (server Core Installation) Microsoft windows Server 2012 R2 Microsoft windows Server 2012 R2 (server Core Installation) Microsoft windows Server 2016 (server Core Installation) Microsoft windows Server 2019 (server Core Installation) Microsoft windows Server 2025 (server Core Installation)
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Tue, 09 Jun 2026 17:15:00 +0000

Type	Values Removed	Values Added
Description		Protection mechanism failure in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.
Title		Secure Boot Security Feature Bypass Vulnerability
First Time appeared		Microsoft Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows Server 2012 Microsoft windows Server 2012 R2 Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025
Weaknesses		CWE-284
CPEs		cpe:2.3:o:microsoft:windows_10_1607:::::::x86:* cpe:2.3:o:microsoft:windows_10_1809:::::::x86:* cpe:2.3:o:microsoft:windows_10_21H2:::::::x86:* cpe:2.3:o:microsoft:windows_10_22H2:::::::x64:* cpe:2.3:o:microsoft:windows_11_23H2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_23H2:::::::x64:* cpe:2.3:o:microsoft:windows_11_24H2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25H2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_26H1:::::::x64:* cpe:2.3:o:microsoft:windows_server_2012:::::::x64:* cpe:2.3:o:microsoft:windows_server_2012_R2:::::::x64:* cpe:2.3:o:microsoft:windows_server_2016:::::::: cpe:2.3:o:microsoft:windows_server_2019:::::::: cpe:2.3:o:microsoft:windows_server_2022:::::::: cpe:2.3:o:microsoft:windows_server_2025::::::::
Vendors & Products		Microsoft Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows 10 21h2 Microsoft windows 10 22h2 Microsoft windows 11 23h2 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 11 26h1 Microsoft windows Server 2012 Microsoft windows Server 2012 R2 Microsoft windows Server 2016 Microsoft windows Server 2019 Microsoft windows Server 2022 Microsoft windows Server 2025
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-48578
Metrics		cvssV3_1 `{'score': 7.9, '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'}`

Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 21h2 Windows 10 22h2 Windows 10 22h2 Windows 11 23h2 Windows 11 23h2 Windows 11 24h2 Windows 11 24h2 Windows 11 25h2 Windows 11 25h2 Windows 11 26h1 Windows 11 26h1 Windows Server 2012 Windows Server 2012 (server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 Windows Server 2012 R2 (server Core Installation) Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-06-09T17:05:15.545Z

Updated: 2026-07-28T22:19:06.596Z

Reserved: 2026-05-21T20:00:35.246Z

Link: CVE-2026-48578

Vulnrichment

Updated: 2026-06-10T10:22:33.063Z

NVD

Status : Analyzed

Published: 2026-06-09T17:17:46.550

Modified: 2026-06-10T15:13:10.440

Link: CVE-2026-48578

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-08-02T02:00:13Z

Weaknesses

CWE-284
Improper Access Control

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

Exploitation none

Automatable no

Technical Impact total

Subscriptions

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