Two 9th grade kids hack ATM - What is strange about it - They used the operator's Manual

Apparently, even the password was not changed from the default one.

(From the article)

Matthew Hewlett and Caleb Turon, both Grade 9 students, found an old ATM operators manual online that showed how to get into the machine's operator mode. 

Hewlett and Turon were even more shocked when their first random guess at the six-digit password worked. They used a common default password.

The link below has more information:-

http://www.winnipegsun.com/2014/06/08/code-crackers--charleswood-teens-hack-into-grant-avenue-atm