ASP.NET MVC 2 - How to override an annotation for a single controller action?

Question

I have a BaseController that all Controllers inherit from. The CaseController has the [Authorize] annotation, so that all controllers require authorization.

But I've just realized that one single controller action must not require authorization. How can I turn off [Authorize] for just that one controller action?

using System.Web.Mvc;
using Unleashed.Service.Interfaces;

namespace Controllers
{
    [Authorize]
    [RequireHttps]
    public class BaseController : Controller
    {
    }
} 

And the controller action is called via a POST from another site. They authorize by passing a token. They will not be authorized via forms authentication.

[Authorize=false] // doesnt compile
[Authorize(false)] // doesnt compile
public ActionResult DoSomething(string token, string data)
{
}

Answer 1

Solved by creating a new controller that does not inherit from BaseController, and adding the action to that controller. Now this one action does not require authorization, and all existing actions remain as is.