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

KB5101007

KB5101007: Cumulative update for .NET Framework, version 4.8, on Windows 10 1607 and Windows Server 2016, July 2026. .NET library flaws addressed; secure web requests could hang

In short

The update addresses 17 security flaws and a problem that could leave some secure web requests hanging with certain server settings.

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

File version
4.8.4803.0
Security
17 fixed
Restart
Required

What changes

Fixes 17 changes

.NET Framework

17 items
  • A flaw could let an attacker make an app stop responding.1
    Addresses CVE-2026-47302, a denial-of-service vulnerability.
  • A flaw could let an attacker bypass a security feature.2
    Addresses CVE-2026-47304, a security feature bypass vulnerability.
  • A flaw could let an attacker make an app stop responding.3
    Addresses CVE-2026-50304, a denial-of-service vulnerability.
  • A flaw could let an attacker make an app stop responding.4
    Addresses CVE-2026-50324, a denial-of-service vulnerability.
  • A flaw could let an attacker make an app stop responding.5
    Addresses CVE-2026-50355, a denial-of-service vulnerability.
  • A flaw could let an attacker make an app stop responding.6
    Addresses CVE-2026-50368, a denial-of-service vulnerability.
  • A flaw could let an attacker make an app stop responding.7
    Addresses CVE-2026-50411, a denial-of-service vulnerability.
  • A flaw could let an attacker make an app stop responding.8
    Addresses CVE-2026-50525, a denial-of-service vulnerability.
  • A flaw could let an attacker make an app stop responding.9
    Addresses CVE-2026-50527, a denial-of-service vulnerability.
  • A flaw could let an attacker gain more access.10
    Addresses CVE-2026-50646, an elevation of privilege vulnerability.
  • A flaw could let an attacker make an app stop responding.11
    Addresses CVE-2026-50647, a denial-of-service vulnerability.
  • A flaw could let an attacker make an app stop responding.12
    Addresses CVE-2026-50648, a denial-of-service vulnerability.
  • A flaw could let an attacker run code.13
    Addresses CVE-2026-50649, a remote code execution vulnerability.
  • A flaw could let an attacker gain more access.14
    Addresses CVE-2026-50650, an elevation of privilege vulnerability.
  • A flaw could let an attacker make an app stop responding.15
    Addresses CVE-2026-50652, a denial-of-service vulnerability.
  • A flaw could let an attacker make an app stop responding.16
    Addresses CVE-2026-50653, a denial-of-service vulnerability.
  • A flaw could let an attacker change data.17
    Addresses CVE-2026-50659, a tampering vulnerability.

Improvement 1 change

.NET Libraries

  • Some secure web requests could hang with certain server settings. The update addresses this problem.18
    Addresses an issue with synchronous HttpWebRequest connections in specific secure connection scenarios with certain server configurations.

Technical details

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

Data sheet

Released
2026-07-14
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaces
KB5087065, KB5082411
Replaced by
KB5120702
VersionFile versionChannel
4.8 4.8.4803.0 General availability

Security

17 vulnerabilities fixed
17 important
VulnerabilitySeverityCVSS
CVE-2026-47304
.NET Security Feature Bypass Vulnerability
 Important 8.1
CVE-2026-50646
.NET Framework Remote Code Execution Vulnerability
 Important 7.8
CVE-2026-50649
.NET Remote Code Execution Vulnerability
 Important 7.8
CVE-2026-50650
.NET Framework Elevation of Privilege Vulnerability
 Important 7.8
CVE-2026-47302
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-50304
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 7.5
CVE-2026-50355
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 7.5
CVE-2026-50368
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 7.5
CVE-2026-50411
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 7.5
CVE-2026-50525
.NET Denial of Service Vulnerability
 Important 7.5
CVE-2026-50527
.NET Framework Denial of Service Vulnerability
 Important 7.5
CVE-2026-50647
Active Directory Federation Server Denial of Service Vulnerability
 Important 7.5
CVE-2026-50648
.NET Framework Denial of Service Vulnerability
 Important 7.5
CVE-2026-50652
Azure Active Directory Denial of Service Vulnerability
 Important 7.5
CVE-2026-50653
Azure Active Directory Denial of Service Vulnerability
 Important 7.5
CVE-2026-50659
.NET Spoofing Vulnerability
 Important 6.5
CVE-2026-50324
Windows Active Directory Federation Services Denial of Service Vulnerability
 Important 5.9

Downloads (Microsoft Update Catalog)

x64 Windows 10 Enterprise LTSB 2016 / Windows Server 2016
59.3 MB
windows10.0-kb5101007-x64-ndp48.msu Main update · KB5101007 SHA-1: b7aebb70…9ae100
x86 Windows 10 Enterprise LTSB 2016
34.6 MB
windows10.0-kb5101007-x86-ndp48.msu Main update · KB5101007 SHA-1: 6e484d44…c40751

Updated components

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

Top changed componentsFiles
WPF24
WCF12
.NET networking6
.NET data access2

Sources

Updated
Cited passages from Microsoft's official notes (18)
  1. 1. This security update addresses a denial of service vulnerability detailed in [CVE-2026-47302.] support.microsoft.com
  2. 2. This security update addresses a security feature bypass vulnerability detailed in [CVE-2026-47304.] support.microsoft.com
  3. 3. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50304.] support.microsoft.com
  4. 4. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50324.] support.microsoft.com
  5. 5. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50355.] support.microsoft.com
  6. 6. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50368.] support.microsoft.com
  7. 7. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50411.] support.microsoft.com
  8. 8. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50525.] support.microsoft.com
  9. 9. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50527.] support.microsoft.com
  10. 10. This security update addresses an elevation of privilege vulnerability detailed in [CVE-2026-50646.] support.microsoft.com
  11. 11. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50647.] support.microsoft.com
  12. 12. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50648.] support.microsoft.com
  13. 13. This security update addresses a remote code execution vulnerability detailed in [CVE-2026-50649.] support.microsoft.com
  14. 14. This security update addresses an elevation of privilege vulnerability detailed in [CVE-2026-50650.] support.microsoft.com
  15. 15. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50652.] support.microsoft.com
  16. 16. This security update addresses a denial of service vulnerability detailed in [CVE-2026-50653.] support.microsoft.com
  17. 17. This security update addresses a tampering vulnerability detailed in [CVE-2026-50659.] support.microsoft.com
  18. 18. - Addresses an issue with synchronous HttpWebRequest connections where requests could hang in specific secure connection scenarios with certain server configurations. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 18 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