Hacker breached Danish national registry with password "123456"

A hacker accessed Denmark's national registry by simply typing "123456" and stayed in the system undetected for 10 days starting September 10. The breach was discovered on October 2; the database held data on about 11 million citizens.

• Password "123456" gave access to a database of 11 million citizens
• The hacker went undetected for 10 days starting September 10
• The breach was discovered on October 2, 12 days after the last login