CVE-2026-0390: UEFI Secure Boot Security Feature Bypass Vulnerability
Reliance on untrusted inputs in a security decision in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.
Other sources
UEFI Secure Boot 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 10.0.14393.9060Patch KB5082198 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19045.7184Patch KB5082200 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5020Patch KB5082142 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.19044.7184Patch KB5082200 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.8644Patch KB5082123
Event History
Frequently Asked Questions
What is the severity of CVE-2026-0390?
The severity of CVE-2026-0390 is critical as it allows an authorized attacker to bypass UEFI Secure Boot protections.
How do I fix CVE-2026-0390?
To fix CVE-2026-0390, apply the relevant patches provided by Microsoft for your affected Windows version.
Which products are affected by CVE-2026-0390?
CVE-2026-0390 affects various versions of Windows Server and Windows 10, including specific builds such as 1607 and 22H2.
Can CVE-2026-0390 be exploited remotely?
CVE-2026-0390 cannot be exploited remotely; it requires local access to the system.
Is there a workaround for CVE-2026-0390?
There is no known workaround for CVE-2026-0390; the recommended action is to install the provided security updates.