Natelaff

**Name of the Vulnerable Software and Affected Versions** Duende.AccessTokenManagement.OpenIdConnect versions prior to 3.0.1 **Description** Duende.AccessTokenManagement.OpenIdConnect is a set of .NET libraries that manage OAuth and OpenId Connect access tokens. HTTP Clients created by `AddUserAccessTokenHttpClient` may use a different user's access token after a token refresh occurs. This occurs because a refreshed token will be captured in pooled `HttpClient` instances, which may be used by a different user. Instead of using `AddUserAccessTokenHttpClient` to create an `HttpClient` that automatically adds a managed token to outgoing requests, you can use the `HttpConext.GetUserAccessTokenAsync` extension method or the `IUserTokenManagementService.GetAccessTokenAsync` method. **Recommendations** For versions prior to 3.0.1, upgrade to Duende.AccessTokenManagement.OpenIdConnect 3.0.1 to fix the issue. As a temporary workaround, consider using the `HttpConext.GetUserAccessTokenAsync` extension method or the `IUserTokenManagementService.GetAccessTokenAsync` method instead of `AddUserAccessTokenHttpClient` to create an `HttpClient` that automatically adds a managed token to outgoing requests.