滤器\'login_redirect\'.

未测试的示例代码：

add_filter( \'wp_login\', \'wpse_78150_login_redirect\' );

function wpse_78150_login_redirect( $url )
{
    # uncomment the next line for debugging
    # var_dump( wp_get_current_user() ); exit;

    if ( ! current_user_can( \'custom_role\' ) )
        return $url;

    return admin_url();
}