Preview 6 expands Union Types, asynchronous validation, and process management features in .NET libraries. Extension blocks ...

Patching is not enough: applications embedding the insecure library will need to be rebuilt, and affected tokens and cookies expired. Developers are advised to check their applications after Microsoft ...

Microsoft released an emergency patch for its ASP.NET Core to fix a high-severity vulnerability that allows unauthenticated attackers to gain SYSTEM privileges on devices that use the Web development ...

Microsoft has released out-of-band updates to address a security vulnerability in ASP.NET Core that could allow an attacker to escalate privileges. The vulnerability, tracked as CVE-2026-40372, ...

Microsoft recently released a security advisory and patched a critical vulnerability in ASP.NET Core that allows an attacker to bypass a security feature over a network due to an inconsistent ...

On October 14, 2025, Microsoft released a security update addressing CVE-2025-55315, a vulnerability in ASP.NET Core that allows HTTP request smuggling. While request smuggling is a known technique, ...

Earlier this week, Microsoft patched a vulnerability that was flagged with the "highest ever" severity rating received by an ASP.NET Core security flaw. This HTTP request smuggling bug (CVE-2025-55315 ...

The Kestrel web server flaw allows request smuggling attacks, but the actual risk depends on the application code and deployment. Microsoft has patched a critical vulnerability in ASP.NET Core that ...

Microsoft has patched an ASP.NET Core vulnerability with a CVSS score of 9.9, which security program manager Barry Dorrans said was "our highest ever." The flaw is in the Kestrel web server component ...

ASP.NET Core and Blazor received the lion's share of updates in .NET 10 Preview 6, with improvements ranging from JavaScript bundler support and server state persistence to enhanced diagnostics and ...