Microsoft has improved the security of all APIs using Azure AD authentication and it's awesome, but it doesn't mean you can relax

Failing to check for permissions in Azure AD access tokens leads to your API being vulnerable

The dangers of embedding secrets in native applications, and how to implement Azure AD authentication there without secrets

Goes through methods of storing secrets in a way where they cannot end up in the shared code repository

Some things to watch out for in your multi-tenant Azure AD applications that support a limited number of tenants

What is the OAuth ROPC flow, why it exists, and why you should not use it for most cases

Some points on why using wildcards (asterisks) in Azure AD app reply URLs may be a bad idea, and how to do it better

Compares two approaches to high-level authorization in an application: groups and app roles

A look at how ASP.NET Core's Data Protection can be setup in a good way using Azure services

Since the new Azure Cosmos DB SDK for .NET is available, I thought I'd look into it and see what's changed.