CVE-2026-58638: Windows Boot Loader Security Feature Bypass Vulnerability
Missing cryptographic step in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.
Other sources
Windows Boot Loader Security Feature Bypass Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33158Patch KB5099536 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9339Patch KB5099535 - Upgrade
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Fixed in 10.0.19045.7548Patch KB5099539 - Upgrade
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Fixed in 6.3.9600.23291Patch KB5099444 - Upgrade
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Fixed in 10.0.28000.2525Patch KB5101649 - Upgrade
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Fixed in 6.2.9200.26226Patch KB5099445 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.8875Patch KB5101650 - Upgrade
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Fixed in 10.0.20348.5386Patch KB5099540 - Upgrade
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Fixed in 10.0.17763.9020Patch KB5099538 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7548Patch KB5099539 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.8875Patch KB5101650
Event History
Frequently Asked Questions
What is the severity of CVE-2026-58638?
The severity of CVE-2026-58638 is classified as medium with a score of 6.
How do I fix CVE-2026-58638?
To fix CVE-2026-58638, ensure that your system is updated with the latest security patches provided by Microsoft.
What type of vulnerability is CVE-2026-58638?
CVE-2026-58638 is a Windows Boot Loader Security Feature Bypass Vulnerability.
Which software versions are affected by CVE-2026-58638?
CVE-2026-58638 affects Microsoft Windows 10, Windows 11, and various versions of Windows Server including 2012, 2016, 2019, and 2025.
Can CVE-2026-58638 be exploited remotely?
CVE-2026-58638 requires local access, meaning it cannot be exploited remotely by an attacker.