You can bypass any action from security token validation (CSRF Token).

~~~
<?php
function my_component_init(){
ossn_add_hook('action', 'validate:bypass', 'my_component_hook');
}
function my_component_hook($hook, $type, array $actions){
//bypass user/login action from validation of security tokens
$actions[] = 'user/login';
return $actions;
}
ossn_register_callback('ossn', 'init', 'my_component_init');
~~~