A new study was conducted by the security firm Keeper Security that analyzed 10 million hacked accounts from breached data dumps for the most popular passwords. 123456 accounts for 17 per cent of the overall amount of hacked accounts the firm used as data sample. Four of the top 10 passwords on the list are composed of just six characters or shorter, its very easy to brute force them it the system is not properly protected. The list of most frequently used passwords hasnt changed over the years.”]
Source: http://securityaffairs.co/wordpress/55361/digital-id/popular-passwords-2016.html