The FormExtension provides a service for building form in your application with the Symfony2 Form component. By default, the FormExtension uses the CSRF Protection avoiding Cross-site request forgery, a method by which a malicious user attempts to make your legitimate users unknowingly submit data that they don’t intend to submit.
You can find more details about CSRF Protection and CSRF token in the Symfony2 Book.
In some cases (for example, when embedding a form in an html email) you might want not to use this protection. The easiest way to avoid this is to understand that it is possible to give specific options to your form builder through the createBuilder() function.
$form = $app['form.factory']->createBuilder('form', null, array('csrf_protection' => false));
That’s it, your form could be submitted from everywhere without CSRF Protection.
This specific example showed how to change the csrf_protection in the $options parameter of the createBuilder() function. More of them could be passed through this parameter, it is as simple as using the Symfony2 getDefaultOptions() method in your form classes. See more here.