diff --git a/AMWD.Common.AspNetCore/BasicAuthentication/IBasicAuthenticationValidator.cs b/AMWD.Common.AspNetCore/BasicAuthentication/IBasicAuthenticationValidator.cs
index b335966..47fd1ef 100644
--- a/AMWD.Common.AspNetCore/BasicAuthentication/IBasicAuthenticationValidator.cs
+++ b/AMWD.Common.AspNetCore/BasicAuthentication/IBasicAuthenticationValidator.cs
@@ -1,5 +1,6 @@
 using System.Net;
 using System.Security.Claims;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace AMWD.Common.AspNetCore.BasicAuthentication
@@ -20,7 +21,8 @@ namespace AMWD.Common.AspNetCore.BasicAuthentication
 		/// <param name="username">A username.</param>
 		/// <param name="password">A password.</param>
 		/// <param name="remoteAddress">The remote client's IP address.</param>
+		/// <param name="cancellationToken">A cancellation token.</param>
 		/// <returns>The validated user principal or <c>null</c>.</returns>
-		Task<ClaimsPrincipal> ValidateAsync(string username, string password, IPAddress remoteAddress);
+		Task<ClaimsPrincipal> ValidateAsync(string username, string password, IPAddress remoteAddress, CancellationToken cancellationToken = default);
 	}
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e07cd74..715414e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - `IPNetworkArrayFormatter` to serialize arrays of `Microsoft.AspNetCore.HttpOverrides.IPNetwork`
   - `IPNetworkListFormatter` to serialize lists of `Microsoft.AspNetCore.HttpOverrides.IPNetwork`
 
+### Changed
+- `IBasicAuthenticationValidator` has the possibillity to cancel the operation
+
 
 ## [v1.7.0](https://git.am-wd.de/AM.WD/common/compare/v1.6.1...v1.7.0) - 2022-07-24
 ### Added