Артем

$app->on(KernelEvents::CONTROLLER, function (FilterControllerEvent $event) use ($app) {
    $c = $event->getController();
    /** @var BaseController $controller */
    $controller = $c[0];
    if ($controller instanceof BaseController) {
        $controller->injectApp($app);
    }
});

abstract class BaseController
{
    protected $app;

    public function injectApp(Application $app)
    {
        $this->app = $app;
        return $this;
    }
}