What is CVE-2026-45656?

CVE-2026-45656 is a high-severity vulnerability in Microsoft Windows_10_1607, classified under Protection Mechanism Failure. CVSS score: 7.8/10. Published 2026-06-09.

How severe is CVE-2026-45656?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Microsoft Windows_10_1607

CVE-2026-45656

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

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

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 — versions r2
Microsoft Windows_server_2016

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

secure@microsoft.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-45656?: CVE-2026-45656 is a high-severity vulnerability in Microsoft Windows_10_1607, classified under Protection Mechanism Failure. CVSS score: 7.8/10. Published 2026-06-09.
How severe is CVE-2026-45656?: High severity. CVSS v3 base score is 7.8 out of 10.