4.0.0

Breaking Changes

Removed support for .NET 6.0 and .NET 7.0 - Microsoft Identity Web 4.0.0 no longer targets .NET 6.0 and .NET 7.0, following Microsoft's support lifecycle. The supported target frameworks are now .NET 8.0, .NET 9.0, .NET Framework 4.6.2, .NET Framework 4.7.2, and .NET Standard 2.0.

See MIGRATION_GUIDE_V4

New features

• Various improvements to performance logging, authentication, and credential loading capabilities.
• Bumped MSAL.NET to 4.77.1
• Added credential description extensibility. For details, see #3487
• Added a new CerticateObserverAction type: SuccessfullyUsed and support for multiple certificate observers for improved certificate lifecycle management and telemetry. See #3505
• Add specification of OID (in addition to upn) when requesting an authorization header for Agent User Identity. See #3513
• Added ClaimsPrincipal and ClaimsIdentity extension methods for agent identity detection in web APIs enabling developers to easily detect agent identities and retrieve parent agent blueprint from token claims. See #3515
• Added MicrosoftIdentityMessageHandler for flexible HttpClient authentication. Provides composable alternative to DownstreamApi with per-request authentication configuration. Supports WWW-Authenticate challenge handling. See #3503
• Support for multiple certificate observers. See #3506
• The Microsoft.Identity.Web.Sidecar will provide a container solution for validation and token acquisition in any-language. See #3524

Bug Fixes

• Fixed TokenAcquirerFactory null reference when AppContext.BaseDirectory is root path. See #3443
• Fixed IDW10405 error when using managed identity with common tenant. See #3415
• Removed hard dependency on IConfiguration in OidcIdpSignedAssertionLoader. See #3414

Fundamentals

• Various improvements to .NET support and dependency optimizations.
• Added doc for Agent identities. See Agent identities
• Combined and fixed test collections. See #3472
• Migrate repository agent rules from .clinerules to agents.md. See #3475
• Add .NET 6.x setup step to dotnetcore.yml workflow, as the default build agents don't have it any longer. See #3489
• Renamed NET 7 tests to ThreadingTests for framework independence. See #3501