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CVE-2026-78447: Windows 10/11 may let attackers raise their access

CVE-2026-78447 · published 1 month ago

Summary

The Windows Biometric Service that handles fingerprint or facial login on Windows 10 (versions 1607, 1809, 21H2, 22H2) and Windows 11 (23H2) contains a coding error that could let a user with normal rights gain higher system access. This could let an insider or malware take control of more functions on the computer. Install the latest Windows security updates from Microsoft as soon as possible to close the gap.

What to do

Update microsoft windows 10 version 1607 to version 10.0.14393.9512 or later.
Update microsoft windows 10 version 1809 to version 10.0.17763.9245 or later.
Update microsoft windows 10 version 21h2 to version 10.0.19044.7725 or later.
Update microsoft windows 10 version 22h2 to version 10.0.19045.7725 or later.
Update microsoft windows 11 version 23h2 to version 10.0.22631.7582 or later.
Update microsoft windows 11 version 24h2 to version 10.0.26100.9445 or later.
Update microsoft windows 11 version 25h2 to version 10.0.26200.9445 or later.
Update microsoft windows 11 version 26h1 to version 10.0.28000.2954 or later.
Update microsoft windows server 2016 to version 10.0.14393.9512 or later.
Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9512 or later.
Update microsoft windows server 2019 to version 10.0.17763.9245 or later.
Update microsoft windows server 2019 (server core installation) to version 10.0.17763.9245 or later.
Update microsoft windows server 2022 to version 10.0.20348.5622 or later.
Update microsoft windows server 2025 to version 10.0.26100.33438 or later.
Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33438 or later.
Update microsoft windows_10_1607 to version 10.0.14393.9512 or later.
Update microsoft windows_10_1809 to version 10.0.17763.9245 or later.
Update microsoft windows_10_21h2 to version 10.0.19044.7725 or later.
Update microsoft windows_10_22h2 to version 10.0.19045.7725 or later.
Update microsoft windows_11_23h2 to version 10.0.22631.7582 or later.
Update microsoft windows_11_24h2 to version 10.0.26100.9445 or later.
Update microsoft windows_11_25h2 to version 10.0.26200.9445 or later.
Update microsoft windows_11_26h1 to version 10.0.28000.2954 or later.
Update microsoft windows_server_2016 to version 10.0.14393.9512 or later.
Update microsoft windows_server_2019 to version 10.0.17763.9245 or later.
Update microsoft windows_server_2022 to version 10.0.20348.5622 or later.
Update microsoft windows_server_2025 to version 10.0.26100.33438 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows 10 version 1607	< 10.0.14393.9512
microsoft	windows 10 version 1809	< 10.0.17763.9245
microsoft	windows 10 version 21h2	< 10.0.19044.7725
microsoft	windows 10 version 22h2	< 10.0.19045.7725
microsoft	windows 11 version 23h2	< 10.0.22631.7582
microsoft	windows 11 version 24h2	< 10.0.26100.9445
microsoft	windows 11 version 25h2	< 10.0.26200.9445
microsoft	windows 11 version 26h1	< 10.0.28000.2954
microsoft	windows server 2016	< 10.0.14393.9512
microsoft	windows server 2016 (server core installation)	< 10.0.14393.9512
microsoft	windows server 2019	< 10.0.17763.9245
microsoft	windows server 2019 (server core installation)	< 10.0.17763.9245
microsoft	windows server 2022	< 10.0.20348.5622
microsoft	windows server 2025	< 10.0.26100.33438
microsoft	windows server 2025 (server core installation)	< 10.0.26100.33438
microsoft	windows_10_1607	< 10.0.14393.9512 `cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*`
microsoft	windows_10_1809	< 10.0.17763.9245 `cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*`
microsoft	windows_10_21h2	< 10.0.19044.7725 `cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*`
microsoft	windows_10_22h2	< 10.0.19045.7725 `cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*`
microsoft	windows_11_23h2	< 10.0.22631.7582 `cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:*`
microsoft	windows_11_24h2	< 10.0.26100.9445 `cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*`
microsoft	windows_11_25h2	< 10.0.26200.9445 `cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*`
microsoft	windows_11_26h1	< 10.0.28000.2954 `cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:*`
microsoft	windows_server_2016	< 10.0.14393.9512 `cpe:2.3:o:microsoft:windows_server_2016::::::::`
microsoft	windows_server_2019	< 10.0.17763.9245 `cpe:2.3:o:microsoft:windows_server_2019::::::::`
microsoft	windows_server_2022	< 10.0.20348.5622 `cpe:2.3:o:microsoft:windows_server_2022::::::::`
microsoft	windows_server_2025	< 10.0.26100.33438 `cpe:2.3:o:microsoft:windows_server_2025::::::::`

Original advisory text

Windows Biometric Service Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows Biometric Service allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78447 vendor-advisory patch

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker full control

Severity

7.8 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-122Heap-based Buffer Overflow

Timeline

Published8 Sep 2026

Updated3 Nov 2026

First seen8 Sep 2026

Sources

CVE-2026-78447 · NVD

CVE-2026-78447 · MITRE

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