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CVE-2026-50435: Windows Overlay Filter Privilege Elevation Risk

CVE-2026-50435 · published 3 months ago

Summary

An attacker with authorized access can use a Windows Overlay Filter to gain higher-level privileges on a local machine. This could allow the attacker to perform actions they normally wouldn't be able to do, potentially compromising the system's security. Affected systems should be updated with the latest security patches as soon as possible.

What to do

Update microsoft windows 10 version 1607 to version 10.0.14393.9339 or later.
Update microsoft windows 10 version 1809 to version 10.0.17763.9020 or later.
Update microsoft windows 10 version 21h2 to version 10.0.19044.7548 or later.
Update microsoft windows 10 version 22h2 to version 10.0.19045.7548 or later.
Update microsoft windows 11 version 24h2 to version 10.0.26100.8875 or later.
Update microsoft windows 11 version 25h2 to version 10.0.26200.8875 or later.
Update microsoft windows server 2012 r2 to version 6.3.9600.23291 or later.
Update microsoft windows server 2012 r2 (server core installation) to version 6.3.9600.23291 or later.
Update microsoft windows server 2016 to version 10.0.14393.9339 or later.
Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9339 or later.
Update microsoft windows server 2019 to version 10.0.17763.9020 or later.
Update microsoft windows server 2019 (server core installation) to version 10.0.17763.9020 or later.
Update microsoft windows server 2022 to version 10.0.20348.5386 or later.
Update microsoft windows server 2025 to version 10.0.26100.33158 or later.
Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33158 or later.
Update microsoft windows_10_1607 to version 10.0.14393.9339 or later.
Update microsoft windows_10_1809 to version 10.0.17763.9020 or later.
Update microsoft windows_10_21h2 to version 10.0.19044.7548 or later.
Update microsoft windows_10_22h2 to version 10.0.19045.7548 or later.
Update microsoft windows_11_24h2 to version 10.0.26100.8875 or later.
Update microsoft windows_11_25h2 to version 10.0.26200.8875 or later.
Update microsoft windows_server_2016 to version 10.0.14393.9339 or later.
Update microsoft windows_server_2019 to version 10.0.17763.9020 or later.
Update microsoft windows_server_2022 to version 10.0.20348.5386 or later.
Update microsoft windows_server_2025 to version 10.0.26100.33158 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows 10 version 1607	< 10.0.14393.9339
microsoft	windows 10 version 1809	< 10.0.17763.9020
microsoft	windows 10 version 21h2	< 10.0.19044.7548
microsoft	windows 10 version 22h2	< 10.0.19045.7548
microsoft	windows 11 version 24h2	< 10.0.26100.8875
microsoft	windows 11 version 25h2	< 10.0.26200.8875
microsoft	windows 11 version 26h1	< 10.0.28000.2269 < 10.0.28000.2525
microsoft	windows server 2012 r2	< 6.3.9600.23291
microsoft	windows server 2012 r2 (server core installation)	< 6.3.9600.23291
microsoft	windows server 2016	< 10.0.14393.9339
microsoft	windows server 2016 (server core installation)	< 10.0.14393.9339
microsoft	windows server 2019	< 10.0.17763.9020
microsoft	windows server 2019 (server core installation)	< 10.0.17763.9020
microsoft	windows server 2022	< 10.0.20348.5386
microsoft	windows server 2025	< 10.0.26100.33158
microsoft	windows server 2025 (server core installation)	< 10.0.26100.33158
microsoft	windows_10_1607	< 10.0.14393.9339 `cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*`
microsoft	windows_10_1809	< 10.0.17763.9020 `cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*`
microsoft	windows_10_21h2	< 10.0.19044.7548 `cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*`
microsoft	windows_10_22h2	< 10.0.19045.7548 `cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*`
microsoft	windows_11_24h2	< 10.0.26100.8875 `cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*`
microsoft	windows_11_25h2	< 10.0.26200.8875 `cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*`
microsoft	windows_11_26h1	< 10.0.28000.2269 < 10.0.28000.2525 `cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:*`
microsoft	windows_server_2012	r2 `cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*`
microsoft	windows_server_2016	< 10.0.14393.9339 `cpe:2.3:o:microsoft:windows_server_2016::::::::`
microsoft	windows_server_2019	< 10.0.17763.9020 `cpe:2.3:o:microsoft:windows_server_2019::::::::`
microsoft	windows_server_2022	< 10.0.20348.5386 `cpe:2.3:o:microsoft:windows_server_2022::::::::`
microsoft	windows_server_2025	< 10.0.26100.33158 `cpe:2.3:o:microsoft:windows_server_2025::::::::`

Original advisory text

Windows Overlay Filter Elevation of Privilege Vulnerability

Buffer over-read in Windows Overlay Filter allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50435 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-126Buffer Over-read

CWE-190Integer Overflow

Timeline

Published14 Jul 2026

Updated4 Nov 2026

First seen14 Jul 2026

Sources

CVE-2026-50435 · NVD

CVE-2026-50435 · MITRE

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