KB5104034: what it fixes and who gets it
KB5104034 is a security update from Microsoft's July 2026 release for .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows.
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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 KB5104034
| CVE | Type | CVSS | Severity |
|---|---|---|---|
| CVE-2026-47300ASP.NET Core Elevation of Privilege Vulnerability | Elevation of Privilege | 8.8 | Important |
| CVE-2026-47303ASP.NET Core Elevation of Privilege Vulnerability | Elevation of Privilege | 8.8 | Important |
| CVE-2026-50528.NET Security Feature Bypass Vulnerability | Security Feature Bypass | 8.2 | Important |
| CVE-2026-47304.NET Security Feature Bypass Vulnerability | Security Feature Bypass | 8.1 | Important |
| CVE-2026-47302.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50524.NET Framework 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-2026-50648.NET Framework Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50651.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-56170ASP.NET Core Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-57108.NET Denial of Service Vulnerability | Denial of Service | 7.5 | Important |
| CVE-2026-50526.NET Tampering Vulnerability | Tampering | 7.0 | Important |
| CVE-2026-50659.NET Spoofing Vulnerability | Spoofing | 6.5 | Important |
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