Summary
Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What kind of security feature could be bypassed by successfully exploiting this vulnerability?
Successfully exploiting this vulnerability could bypass UEFI Secure Boot, a security feature designed to ensure that only trusted software runs when a device starts. This could allow an attacker with local administrator privileges or physical access to run untrusted code early in the boot process, before the operating system’s protections are active.
Security updates
10.0.26300.9711 — https://support.microsoft.com/help/5127648
10.0.17763.9376 — https://support.microsoft.com/help/5126651
10.0.20348.5761 — https://support.microsoft.com/help/5126655
10.0.19044.7807 — https://support.microsoft.com/help/5126657
10.0.26100.33650 — https://support.microsoft.com/help/5126646
10.0.22631.7652 — https://support.microsoft.com/help/5126653
10.0.28000.3231 — https://support.microsoft.com/help/5127646
10.0.14393.9612 — https://support.microsoft.com/help/5126868
6.2.9200.26434 — https://support.microsoft.com/help/5126835
6.3.9600.23470 — https://support.microsoft.com/help/5126836
Vulnerabilities 1
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High 7.8
UEFI Secure Boot Security Feature Bypass Vulnerability
Improper resource shutdown or release in Windows UEFI allows an authorized attacker to bypass a security feature locally.
Revision history
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#1
Information published.
References
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CVE-2026-49785 UEFI Secure Boot Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49785
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss