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

KB5087065

KB5087065: Cumulative update for .NET Framework, version 4.8, on Windows 10 1607 and Windows Server 2016, May 2026. Two flaws that could give attackers more access are addressed

In short

Addresses two .NET Framework flaws that could let attackers gain more access.

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

File version
4.8.4802.0
Security
2 fixed
Restart
Required

What changes

Fixes 2 changes

.NET Framework

2 items
  • A security flaw that could let an attacker gain more access is addressed.1
    CVE-2026-32177 is an elevation-of-privilege vulnerability.
  • A security flaw that could let an attacker gain more access is addressed.2
    CVE-2026-35433 is an elevation-of-privilege vulnerability.

Technical details

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

Data sheet

Released
2026-05-12
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaces
KB5082411, KB5066136
Replaced by
KB5101007
VersionFile versionChannel
4.8 4.8.4802.0 General availability

Security

2 vulnerabilities fixed
2 important
VulnerabilitySeverityCVSS
CVE-2026-32177
.NET Elevation of Privilege Vulnerability
 Important 7.3
CVE-2026-35433
.NET Elevation of Privilege Vulnerability
 Important 7.3

Downloads (Microsoft Update Catalog)

x64 Windows 10 Enterprise LTSB 2016 / Windows Server 2016
60.9 MB
windows10.0-kb5087065-x64-ndp48.msu Main update · KB5087065 SHA-1: 631ce425…c5b049
x86 Windows 10 Enterprise LTSB 2016
33.5 MB
windows10.0-kb5087065-x86-ndp48.msu Main update · KB5087065 SHA-1: 2dd76120…2ee7a2

Updated components

34 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 a Elevation of Privilege vulnerability detailed in CVE-2026-32177. support.microsoft.com
  2. 2. This security update addresses a Elevation of Privilege vulnerability detailed in CVE-2026-35433. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 2 quoted passages · compared with Microsoft's page on Sep 25, 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 5/5, 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