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.NET Framework 4.8 .NET Framework 4.8 Security update
Patch Tuesday

KB5126047

KB5126047: Cumulative update for .NET Framework, version 4.8, on Windows 10 1607 and Windows Server 2016, September 2026. Two .NET vulnerabilities addressed

In short

Addresses two Important .NET Framework vulnerabilities, including one that could allow remote code execution. A restart might be required if affected files are in use.

Does it affect you? Applies to: Devices running Windows 10, version 1607, or Windows Server 2016 with .NET Framework 4.8 installed.

File version
4.8.4806.0
Security
2 fixed
Restart
Required

What changes

Fixes 2 changes

.NET Framework

2 items
  • Addresses an elevation-of-privilege vulnerability in .NET Framework.1
    CVE-2026-62886.
  • Addresses a vulnerability that could allow remote code execution in .NET Framework.2
    CVE-2026-69522.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-09-08
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaces
KB5120702, KB5101007
Replaced by
KB5127684
VersionFile versionChannel
4.8 4.8.4806.0 General availability

Security

2 vulnerabilities fixed
2 important
VulnerabilitySeverityCVSS
CVE-2026-69522
.NET and Visual Studio Remote Code Execution Vulnerability
 Important 8.8
CVE-2026-62886
.NET Elevation of Privilege Vulnerability
 Important 7.8

Downloads (Microsoft Update Catalog)

x64 Windows Server 2016 / Windows 10 Enterprise LTSB 2016
61.2 MB
windows10.0-kb5126047-x64-ndp48.msu Main update · KB5126047 SHA-1: 3d28880e…4cfcf6
x86 Windows 10 Enterprise LTSB 2016
34.6 MB
windows10.0-kb5126047-x86-ndp48.msu Main update · KB5126047 SHA-1: 153084f4…0b45e9

Updated components

36 files changed since the previous update for the same versions.

Top changed componentsFiles
WPF22

Sources

Updated
Cited passages from Microsoft's official notes (2)
  1. 1. This security update addresses an elevation of privilege vulnerability detailed in CVE-2026-62886. support.microsoft.com
  2. 2. This security update addresses a remote code execution vulnerability detailed in CVE-2026-69522. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 2 quoted passages · compared with Microsoft's page on Nov 8, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 5/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake