CVE-2026-40372
Critical
Description
Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
SeverityCritical
CVSS9.1
Exploit probability96. percentile11.2%
Product
Microsoft Asp.net Core
PublishedApr 21, 2026
First seenApr 21, 2026
Weakness typeCWE-347CWE-347
How to fix
Update
- microsoft asp.net_core10.0.7 or later
- Microsoft.AspNetCore.DataProtection10.0.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft asp.net_core | 10.0.0 ≤ v < 10.0.7 | 10.0.7 |
| Microsoft.AspNetCore.DataProtectionNuGet | 10.0.0 ≤ v < 10.0.7 | 10.0.7 |
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