Microsoft · Security update · April 21, 2026
KB5091596: April 2026 security update
KB5091596, released April 21, 2026, fixes 1 CVE in ASP.NET Core 10.0. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
1
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Microsoft's assessment
Highest EPSS
0.1121
95th percentile
Applies to
| Product |
|---|
| ASP.NET Core 10.0 |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| High | CVE-2026-40372 | ASP.NET Core | Elevation of Privilege | 9.1 | 0.1121 | Exploitation Less Likely |
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