Microsoft · Security update · September 8, 2026
KB5126053: September 2026 security update
KB5126053, released September 8, 2026, fixes 2 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.
HighUnsupported product
CVEs closed
2
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Microsoft's assessment
Highest EPSS
0.0084
58th percentile
Priority of the 2 CVEs
Patch now 0
Urgent 0
High 2
Routine 0
Applies to
| Product |
|---|
| Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems |
| Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems |
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-2026-62886 | .NET | Elevation of Privilege | 7.8 | 0.0047 | Exploitation Less Likely |
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