Microsoft · Security update · September 8, 2026
KB5126105: September 2026 security update
KB5126105, released September 8, 2026, fixes 6 CVEs across 4 products. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
6
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0086
58th percentile
Priority of the 6 CVEs
Patch now 0
Urgent 0
High 5
Routine 1
Applies to
| Product |
|---|
| .NET 9.0 runtime installed on Linux |
| .NET 9.0 runtime installed on Mac OS |
| .NET 9.0 runtime installed on Windows |
| ASP.NET Core 9.0 |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| High | CVE-2026-69522 | Visual Studio | Remote Code Execution | 8.8 | 0.0084 | Exploitation Unlikely |
| High | CVE-2026-69806 | .NET | Elevation of Privilege | 7.0 | 0.0082 | Exploitation Less Likely |
| High | CVE-2026-69439 | .NET and Visual Studio | Elevation of Privilege | 8.8 | 0.0082 | Exploitation Unlikely |
| High | CVE-2026-71328 | Visual Studio | Remote Code Execution | 8.8 | 0.0082 | Exploitation Unlikely |
| High | CVE-2026-58649 | .NET | Information Disclosure | 7.0 | 0.0036 | Exploitation Less Likely |
| Routine | CVE-2026-69304 | ASP.NET Core | Denial of Service | 5.9 | 0.0086 | Exploitation Less Likely |
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