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CVE record · CVE-2026-50305

Microsoft Brokering File System Elevation of Privilege Vulnerability

CVSS 7.8 HighEPSS 0.0026 · 17th percentile

Published by the CVE Program (CNA: microsoft) at 14 Jul 2026, 17:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Windows 11 Version 24H2
  • affected 10.0.26100.0 to before 10.0.26100.8875 custom
Microsoft Windows 11 Version 25H2
  • affected 10.0.26200.0 to before 10.0.26200.8875 custom
Microsoft Windows 11 version 26H1
  • affected 10.0.28000.0 to before 10.0.28000.2525 custom
Microsoft Windows Server 2025
  • affected 10.0.26100.0 to before 10.0.26100.33158 custom
Microsoft Windows Server 2025 (Server Core installation)
  • affected 10.0.26100.0 to before 10.0.26100.33158 custom
Identifiers
CVE-2026-50305
CNA
microsoft
Weakness (CWE)
CWE-362 · CWE-416
Tags
Published
14 Jul 2026
Updated
10 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Microsoft Windows 11 (versions 24H2, 25H2 and 26H1) and Windows Server 2025 (including Server Core installations) are affected in Microsoft Brokering File System, before the builds 10.0.26100.8875, 10.0.26200.8875, 10.0.28000.2525 and 10.0.26100.33158 respectively. A use-after-free flaw lets an authorized local attacker elevate privileges. The source gives few details on the exact conditions. Upgrade to the fixed build for your version; no other workaround is listed.

Written 13 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.8 High 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.0026, the 17th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 14 Jul 2026, 17:06 UTC Confirmed by the CVE List

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.