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.NET Framework 3.5 / 4.7.2 .NET Framework 3.5 / 4.7.2 Security update
Patch Tuesday

KB5087061

KB5087061: Cumulative update for .NET Framework, versions 3.5 and 4.7.2, on Windows 10 1809 and Windows Server 2019, May 2026. Two flaws that could raise access are addressed

In short

The update addresses two flaws that could let attackers gain higher access. It adds no new reliability improvements.

Does it affect you? Applies to: Devices running Windows 10, version 1809, or Windows Server 2019, with .NET Framework 3.5 or 4.7.2 installed.

File version
2.0.50727.9068 · 4.7.4142.0
Security
2 fixed
Restart
Required

What changes

Fixes 2 changes

.NET Framework

2 items
  • A flaw that could let an attacker gain higher access is addressed.1
    CVE-2026-32177 is a .NET Framework elevation-of-privilege vulnerability.
  • A flaw that could let an attacker gain higher access is addressed.2
    CVE-2026-35433 is a .NET Framework 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
KB5082413, KB5066143
Replaced by
KB5100989
VersionFile versionChannel
3.5 2.0.50727.9068 General availability
4.7.2 4.7.4142.0 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 Server 2019 / Windows 10 Enterprise LTSC 2019
84.2 MB
windows10.0-kb5087061-x64.msu Main update · KB5087061 SHA-1: 25b4ce6e…7d8e3f
Arm64 Windows 10 Enterprise LTSC 2019
47.3 MB
windows10.0-kb5087061-arm64.msu Main update · KB5087061 SHA-1: ac048453…e76da2
x86 Windows 10 Enterprise LTSC 2019
47.3 MB
windows10.0-kb5087061-x86.msu Main update · KB5087061 SHA-1: 60a7159f…5e7613

Updated components

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

Top changed componentsFiles
WPF42

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