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CVE-2026-50305: Microsoft Brokering File System Local Privilege Elevation Risk

CVE-2026-50305 · published 3 months ago

Summary

An authorized user on a Windows system can gain more access than they should. This could allow them to make changes to the system that they shouldn't be able to make. Update your Microsoft Brokering File System to the latest version to fix this issue.

What to do

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 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_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_2025 to version 10.0.26100.33158 or later.

Affected software

Vendor	Product	Affected versions
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 2025	< 10.0.26100.33158
microsoft	windows server 2025 (server core installation)	< 10.0.26100.33158
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_2025	< 10.0.26100.33158 `cpe:2.3:o:microsoft:windows_server_2025::::::::`

Original advisory text

Microsoft Brokering File System Elevation of Privilege Vulnerability

Use after free in Microsoft Brokering File System allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50305 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-416Use After Free

CWE-362Race Condition

Timeline

Published14 Jul 2026

Updated4 Nov 2026

First seen14 Jul 2026

Sources

CVE-2026-50305 · NVD

CVE-2026-50305 · MITRE

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