KB5127686: what it fixes and who gets it
KB5127686 is a security update from Microsoft's October 2026 release for Microsoft .NET Framework 4.8 on Windows Server 2012.
Microsoft data read
Should you install it?
Yes. It closes holes Microsoft rates Critical, the most serious rating it uses. 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 KB5127686
| CVE | Type | CVSS | Severity |
|---|---|---|---|
| CVE-2026-96222Active Directory Federation Services (AD FS) Spoofing Vulnerability | Spoofing | 7.4 | Critical |
| CVE-2026-102869.NET and Visual Studio Elevation of Privilege Vulnerability | Elevation of Privilege | 8.8 | Important |
| CVE-2026-108398.NET Framework Security Feature Bypass Vulnerability | Security Feature Bypass | 8.8 | Important |
| CVE-2026-70007.NET Framework Remote Code Execution Vulnerability | Remote Code Execution | 8.8 | Important |
| CVE-2026-70035.NET Framework Remote Code Execution Vulnerability | Remote Code Execution | 8.8 | Important |
| CVE-2026-70174.NET Remote Code Execution Vulnerability | Remote Code Execution | 8.8 | Important |
| CVE-2026-83520.NET Remote Code Execution Vulnerability | Remote Code Execution | 8.8 | Important |
| CVE-2026-85363.NET Framework Elevation of Privilege Vulnerability | Elevation of Privilege | 8.8 | Important |
| CVE-2026-96224.NET Remote Code Execution Vulnerability | Remote Code Execution | 8.8 | Important |
| CVE-2026-58280.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-69651.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-84008.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-96233ASP.NET Core Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-96958.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-96959.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-96960.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-97788Active Directory Federation Services (AD FS) Information Disclosure Vulnerability | Information Disclosure | 7.5 | Important |
| CVE-2026-97801.NET Framework Tampering Vulnerability | Tampering | 7.5 | Important |
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