KB5100990: what it fixes and who gets it
KB5100990 is a security update from Microsoft's July 2026 release for Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012.
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Should you install it?
Yes. It is a routine security update; none of its fixes are rated Critical or reported as exploited. Windows Update installs it automatically on supported home PCs.
If the installation fails or the PC misbehaves afterwards, note the exact error code first: the fix depends on it. Our update troubleshooting guides are linked on this page.
Security fixes in KB5100990
| CVE | Type | CVSS | Severity |
|---|---|---|---|
| CVE-2026-47304.NET Security Feature Bypass Vulnerability | Security Feature Bypass | 8.1 | Important |
| CVE-2026-50646.NET Framework Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-50649.NET Remote Code Execution Vulnerability | Remote Code Execution | 7.8 | Important |
| CVE-2026-50650.NET Framework Elevation of Privilege Vulnerability | Elevation of Privilege | 7.8 | Important |
| CVE-2026-47302.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50304Windows Active Directory Federation Services Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50355Windows Active Directory Federation Services Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50368Windows Active Directory Federation Services Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50411Windows Active Directory Federation Services Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50525.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50527.NET Framework Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50647Active Directory Federation Server Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50648.NET Framework Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50652Azure Active Directory Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50653Azure Active Directory Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50659.NET Spoofing Vulnerability | Spoofing | 6.5 | Important |
| CVE-2026-50324Windows Active Directory Federation Services Denial of Service Vulnerability | Denial of Service | 5.9 | Important |
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