Microsoft · Security update · June 9, 2026
KB5097149: June 2026 security update
KB5097149, released June 9, 2026, fixes 3 CVEs across 5 products. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
3
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Microsoft's assessment
Highest EPSS
0.0248
84th percentile
Priority of the 3 CVEs
Patch now 0
Urgent 0
High 3
Routine 0
Applies to
| Product |
|---|
| .NET 8.0 |
| .NET 8.0 runtime installed on Linux |
| .NET 8.0 runtime installed on Mac OS |
| .NET 8.0 runtime installed on Windows |
| ASP.NET Core 8.0 |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| High | CVE-2026-45591 | ASP.NET Core | Denial of Service | 7.5 | 0.0248 | Exploitation Less Likely |
| High | CVE-2026-45491 | .NET | Tampering | 7.5 | 0.0039 | Exploitation Unlikely |
| High | CVE-2026-45490 | .NET | Elevation of Privilege | 7.8 | 0.0038 | Exploitation Less Likely |
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