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

KB5127684

KB5127684: Cumulative update for .NET Framework, version 4.8, on Windows 10 1607 and Windows Server 2016, October 2026. Critical spoofing flaw among 20 vulnerabilities fixed

In short

Fixes 20 vulnerabilities, including one critical spoofing flaw and a publicly disclosed security-feature bypass. It applies to .NET Framework 4.8 on Windows 10, version 1607 and Windows Server 2016.

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

File version
4.8.4811.0
Security
20 fixed · 1 critical
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • What changes CVE-2026-102869 was added as an Important vulnerability for this update.

The official sources are linked at the end of the page.

What changes

Fixes 19 changes

.NET Framework

19 items
  • A flaw that could make a service stop responding is fixed.1
    CVE-2026-58280: .NET Framework Denial of Service vulnerability.
  • A flaw that could let someone gain higher access is fixed.2
    CVE-2026-69439: .NET Framework Elevation of Privilege vulnerability.
  • A flaw that could make a service stop responding is fixed.3
    CVE-2026-69651: .NET Framework Denial of Service vulnerability.
  • A flaw that could let an attacker run code is fixed.4
    CVE-2026-70007: .NET Framework Remote Code Execution vulnerability.
  • A flaw that could let an attacker run code is fixed.5
    CVE-2026-70035: .NET Framework Remote Code Execution vulnerability.
  • A flaw that could let an attacker run code is fixed.6
    CVE-2026-70174: .NET Framework Remote Code Execution vulnerability.
  • A flaw that could let an attacker run code is fixed.7
    CVE-2026-83520: .NET Framework Remote Code Execution vulnerability.
  • A flaw that could make a service stop responding is fixed.8
    CVE-2026-84008: .NET Framework Denial of Service vulnerability.
  • A flaw that could let someone gain higher access is fixed.9
    CVE-2026-85363: .NET Framework Elevation of Privilege vulnerability.
  • A flaw that could let an attacker run code is fixed.10
    CVE-2026-87697: .NET Framework Remote Code Execution vulnerability.
  • A flaw that could let someone fake trusted information is fixed.11
    CVE-2026-96222: .NET Framework Spoofing vulnerability.
  • A flaw that could let an attacker run code is fixed.12
    CVE-2026-96224: .NET Framework Remote Code Execution vulnerability.
  • A flaw that could make a service stop responding is fixed.13
    CVE-2026-96233: .NET Framework Denial of Service vulnerability.
  • A flaw that could make a service stop responding is fixed.14
    CVE-2026-96958: .NET Framework Denial of Service vulnerability.
  • A flaw that could make a service stop responding is fixed.15
    CVE-2026-96959: .NET Framework Denial of Service vulnerability.
  • A flaw that could make a service stop responding is fixed.16
    CVE-2026-96960: .NET Framework Denial of Service vulnerability.
  • A flaw that could expose information is fixed.17
    CVE-2026-97788: .NET Framework Information Disclosure vulnerability.
  • A flaw that could let someone change data is fixed.18
    CVE-2026-97801: .NET Framework Tampering vulnerability.
  • A flaw that could bypass a security feature is fixed.19
    CVE-2026-108398: .NET Framework Security Feature Bypass vulnerability.

Technical details

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

Data sheet

Released
2026-10-13
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaces
KB5126047, KB5120702
VersionFile versionChannel
4.8 4.8.4811.0 General availability

Security

20 vulnerabilities fixed
1 critical 17 important 2 not rated
VulnerabilitySeverityCVSS
CVE-2026-96222
Active Directory Federation Services (AD FS) Spoofing Vulnerability
 Critical 7.4
CVE-2026-102869
.NET and Visual Studio Elevation of Privilege Vulnerability
 Important 8.8
CVE-2026-108398
.NET Framework Security Feature Bypass Vulnerability
 Important 8.8
CVE-2026-70007
.NET Framework Remote Code Execution Vulnerability
 Important 8.8
CVE-2026-70035
.NET Framework Remote Code Execution Vulnerability
 Important 8.8
CVE-2026-70174
.NET Remote Code Execution Vulnerability
 Important 8.8
CVE-2026-83520
.NET Remote Code Execution Vulnerability
 Important 8.8
CVE-2026-85363
.NET Framework Elevation of Privilege Vulnerability
 Important 8.8
CVE-2026-96224
.NET Remote Code Execution Vulnerability
 Important 8.8
CVE-2026-58280
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-69651
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-84008
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-96233
ASP.NET Core Denial of Service Vulnerability
 Important 7.5
CVE-2026-96958
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-96959
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-96960
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-97788
Active Directory Federation Services (AD FS) Information Disclosure Vulnerability
 Important 7.5
CVE-2026-97801
.NET Framework Tampering Vulnerability
 Important 7.5
CVE-2026-69439
.NET and Visual Studio Elevation of Privilege Vulnerability
 Not rated —
CVE-2026-87697
.NET Remote Code Execution Vulnerability
 Not rated —

Downloads (Microsoft Update Catalog)

x64 Windows 10 Enterprise LTSB 2016 / Windows Server 2016
59.4 MB
windows10.0-kb5127684-x64-ndp48.msu Main update · KB5127684 SHA-1: 8d929ad1…d8d00f
x86 Windows 10 Enterprise LTSB 2016
34.7 MB
windows10.0-kb5127684-x86-ndp48.msu Main update · KB5127684 SHA-1: f9c13ae3…73a7a2

Updated components

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

Top changed componentsFiles
WPF24
WCF15
.NET runtime (CLR)12
ASP.NET3
.NET data access2
.NET networking2
Windows Forms2

Sources

Updated
Cited passages from Microsoft's official notes (19)
  1. 1. This security update addresses a denial of service vulnerability detailed in CVE-2026-58280. support.microsoft.com
  2. 2. This security update addresses an elevation of privilege vulnerability detailed in CVE-2026-69439. support.microsoft.com
  3. 3. This security update addresses a denial of service vulnerability detailed in CVE-2026-69651. support.microsoft.com
  4. 4. This security update addresses a remote code execution vulnerability detailed in CVE-2026-70007. support.microsoft.com
  5. 5. This security update addresses a remote code execution vulnerability detailed in CVE-2026-70035. support.microsoft.com
  6. 6. This security update addresses a remote code execution vulnerability detailed in CVE-2026-70174. support.microsoft.com
  7. 7. This security update addresses a remote code execution vulnerability detailed in CVE-2026-83520. support.microsoft.com
  8. 8. This security update addresses a denial of service vulnerability detailed in CVE-2026-84008. support.microsoft.com
  9. 9. This security update addresses an elevation of privilege vulnerability detailed in CVE-2026-85363. support.microsoft.com
  10. 10. This security update addresses a remote code execution vulnerability detailed in CVE-2026-87697. support.microsoft.com
  11. 11. This security update addresses a spoofing vulnerability detailed in CVE-2026-96222. support.microsoft.com
  12. 12. This security update addresses a remote code execution vulnerability detailed in CVE-2026-96224. support.microsoft.com
  13. 13. This security update addresses a denial of service vulnerability detailed in CVE-2026-96233. support.microsoft.com
  14. 14. This security update addresses a denial of service vulnerability detailed in CVE-2026-96958. support.microsoft.com
  15. 15. This security update addresses a denial of service vulnerability detailed in CVE-2026-96959. support.microsoft.com
  16. 16. This security update addresses a denial of service vulnerability detailed in CVE-2026-96960. support.microsoft.com
  17. 17. This security update addresses an information disclosure vulnerability detailed in CVE-2026-97788. support.microsoft.com
  18. 18. This security update addresses a tampering vulnerability detailed in CVE-2026-97801. support.microsoft.com
  19. 19. This security update addresses a security feature bypass vulnerability detailed in CVE-2026-108398. support.microsoft.com
Checked automatically: 7 of 8 checks passed, 19 quoted passages · compared with Microsoft's page on Nov 14, 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: not passed

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