# KB5126106: September 2026 security update

KB5126106, released September 8, 2026, fixes 6 CVEs across 4 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/microsoft/kb5126106
- Platform: Microsoft
- Released: Sep 8, 2026
- Priority: High (Closes CVE-2026-69522, high severity)
- CVEs: 6, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5126106

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [.NET 10.0 runtime installed on Linux](https://patchblox.com/security/data/product/microsoft/net-10.0-runtime-installed-on-linux.md) |  |  |
| [.NET 10.0 runtime installed on Mac OS](https://patchblox.com/security/data/product/microsoft/net-10.0-runtime-installed-on-mac-os.md) |  |  |
| [.NET 10.0 runtime installed on Windows](https://patchblox.com/security/data/product/microsoft/net-10.0-runtime-installed-on-windows.md) |  |  |
| [ASP.NET Core 10.0](https://patchblox.com/security/data/product/microsoft/asp.net-core-10.0.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-69522](https://patchblox.com/security/data/cve/CVE-2026-69522.md) | High | Visual Studio | 8.8 | 0.0084 |  |
| [CVE-2026-69806](https://patchblox.com/security/data/cve/CVE-2026-69806.md) | High | .NET | 7.0 | 0.0082 |  |
| [CVE-2026-69439](https://patchblox.com/security/data/cve/CVE-2026-69439.md) | High | .NET and Visual Studio | 8.8 | 0.0082 |  |
| [CVE-2026-71328](https://patchblox.com/security/data/cve/CVE-2026-71328.md) | High | Visual Studio | 8.8 | 0.0082 |  |
| [CVE-2026-58649](https://patchblox.com/security/data/cve/CVE-2026-58649.md) | High | .NET | 7.0 | 0.0036 |  |
| [CVE-2026-69304](https://patchblox.com/security/data/cve/CVE-2026-69304.md) | Routine | ASP.NET Core | 5.9 | 0.0086 |  |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo