Issues

• [Breaking change]: OpenID Connect max_age validates auth_time

  Breaking change
  aspnet/Announcements#537 · Filter by author javiercn opened on Sep 15, 2026

• [Breaking change]: Identity external login keys use ordinal equality

  Breaking change
  aspnet/Announcements#536 · Filter by author javiercn opened on Sep 14, 2026

• [Breaking change]: Blazor server-side rendering defers antiforgery validation to middleware

  11.0.0Breaking changeDocumented
  aspnet/Announcements#535 · Filter by author DeagleGross opened on Sep 1, 2026
  1

• [Breaking change]: Obsolete members in ImageTagHelper are removed

  11.0.0Breaking changeDocumented
  aspnet/Announcements#534 · Filter by author Youssef1313 opened on Aug 5, 2026
  

• [Breaking change]: Mvc compatibility options are removed

  11.0.0Breaking changeDocumented
  aspnet/Announcements#533 · Filter by author Youssef1313 opened on Aug 5, 2026
  

• [Breaking change]: ModelMetadataIdentity.ForProperty(Type modelType, string name, Type containerType) is removed

  11.0.0Breaking changeDocumented
  aspnet/Announcements#532 · Filter by author Youssef1313 opened on Aug 5, 2026
  

• Deprecating Microsoft.AspNetCore.SignalR.Redis and Microsoft.AspNetCore.SignalR.Protocols.MessagePack (1.2.x)

  AnnouncementBreaking changeDocumented
  aspnet/Announcements#531 · Filter by author wtgodbe opened on Jul 28, 2026

• [Breaking change]: OpenApiVersion default change from OpenApiSpecVersion.OpenApi3_1 to OpenApiSpecVersion.OpenApi3_2

  11.0.0Breaking changeDocumented
  aspnet/Announcements#530 · Filter by author Youssef1313 opened on Jun 16, 2026
  

• ASP.NET Core 2.3 will reach end of support on April 13, 2027

  AnnouncementBreaking changeDocumented
  aspnet/Announcements#529 · Filter by author wtgodbe opened on Apr 7, 2026

• Deprecating ASP.NET WebHooks

  AnnouncementBreaking changeDocumented
  aspnet/Announcements#528 · Filter by author wtgodbe opened on Mar 6, 2026

• [Breaking change]: Deprecating WebHostBuilder, IWebHost, and WebHost

  10.0.0Breaking changeDocumented
  aspnet/Announcements#526 · Filter by author BrennanConroy opened on Aug 29, 2025

• [Breaking change]: Cookie login redirects are disabled for known API endpoints

  10.0.0Breaking changeDocumented
  aspnet/Announcements#525 · Filter by author halter73 opened on Aug 1, 2025

• [Breaking change]: Exception diagnostics are suppressed when IExceptionHandler.TryHandleAsync returns true

  10.0.0Breaking changeDocumented
  aspnet/Announcements#524 · Filter by author JamesNK opened on Jul 28, 2025

• [Breaking change]: Obsolete IPNetwork and ForwardedHeadersOptions.KnownNetworks

  10.0.0Breaking changeDocumented
  aspnet/Announcements#523 · Filter by author BrennanConroy opened on Jul 24, 2025

• [Breaking change]: Razor runtime compilation is obsolete

  10.0.0Breaking changeDocumented
  aspnet/Announcements#522 · Filter by author BrennanConroy opened on Jul 24, 2025

• [Breaking change]: IncludeOpenAPIAnalyzers property and MVC API analyzers are deprecated

  10.0.0Breaking changeDocumented
  aspnet/Announcements#521 · Filter by author captainsafia opened on Jul 23, 2025

• [Breaking change]: Deprecation of IActionContextAccessor

  10.0.0Breaking changeDocumented
  aspnet/Announcements#520 · Filter by author captainsafia opened on Jul 18, 2025

• [Breaking change]: Deprecation of WithOpenApi extension method

  10.0.0Breaking changeDocumented
  aspnet/Announcements#519 · Filter by author captainsafia opened on Jul 17, 2025
  

• [Breaking change]: Deprecation of Microsoft.Extensions.ApiDescription.Client package

  10.0.0Breaking changeDocumented
  aspnet/Announcements#518 · Filter by author captainsafia opened on Jul 9, 2025

• [Breaking change]: Forwarded Headers Middleware Now Ignores X-Forwarded-* Headers from Unknown Proxies

  10.0.0Breaking changeDocumented
  aspnet/Announcements#517 · Filter by author BrennanConroy opened on Jul 2, 2025

• [Breaking change]: Legacy Mono and Emscripten JavaScript APIs are not exported to global namespace in Blazor WebAssembly applications

  9.0.0Breaking changeDocumented
  aspnet/Announcements#516 · Filter by author maraf opened on Nov 15, 2024

• [Breaking change]: dev cert export no longer creates folder

  8.0.0Breaking changeDocumented
  aspnet/Announcements#515 · Filter by author amcasey opened on Oct 22, 2024
  1

• [Breaking change]: Handling of middleware types with multiple constructors

  9.0.0Breaking changeDocumented
  aspnet/Announcements#514 · Filter by author amcasey opened on Oct 21, 2024
  1

• [Breaking change]: DefaultKeyResolution.ShouldGenerateNewKey has a slightly altered meaning

  9.0.0Breaking changeDocumented
  aspnet/Announcements#512 · Filter by author amcasey opened on Mar 11, 2024
  4

• [Breaking change]: Minimal APIs consuming IFormFile or IFormFileCollection parameters require anti-forgery checks

  Breaking changeDocumented
  aspnet/Announcements#509 · Filter by author captainsafia opened on Nov 27, 2023