Who Didn't See This Coming?

A hacker broke into part of the HealthCare.gov insurance enrollment website in July

and uploaded malicious software, according to federal officials.

MarketWatch

And they are just now telling us about it.

Good job!

An HHS official said the attack appears to mark the first successful intrusion into the website,

The operative word here is "appears". 

In other words, they are not really sure.

Or, they know, and just not telling.

Most companies don't know if they are hacked until someone, usually a client, notices something suspicious. If a company says they have never been hacked they are either lying or they don't know they were hacked.