X-aspnetmvc-version Jun 2026

Modern security best practices dictate that this header should be removed or suppressed. It is considered "information leakage" that provides no benefit to the end-user and serves as a potential aid to malicious actors.

In the landscape of web development and information security, HTTP response headers play a pivotal role in facilitating communication between the server and the client. Among these, the X-AspNetMvc-Version header is a specific identifier used by applications built on the Microsoft ASP.NET MVC framework. x-aspnetmvc-version

The header is generated by the MvcHandler class, responsible for processing MVC requests. When the Application_Start method initializes the routing table, the framework binds the version string (e.g., 5.2 , 4.0 , 3.0 ) from the assembly's AssemblyFileVersionAttribute . This value is appended to the outgoing response collection. Unlike the X-AspNet-Version header (which reports .NET runtime version), X-AspNetMvc-Version is specific to the MVC library. Modern security best practices dictate that this header