A computer server hosting information for Healthcare.gov, the flagship Obamacare website that millions of Americans have trusted with their social security numbers, income totals and other sensitive personal information, was the subject of a hacker attack earlier this summer, officials said Thursday. The federal government wasn't aware it had been hacked on July 8 until just ten days ago. The admission is fueling fires on Capitol Hill. The powerful House Oversight and Government Reform Committee announced Thursday afternoon that it has ordered Centers for Medicare and Medicaid Services (CMS) chief Marilyn Tavenner to testify in a September 18 hearing about the Obamacare website's security lapses.
@highlight
Malicious code was inserted into an Obamacare server and lay dormant, waiting for a command to attack other computers
@highlight
Obama administration claims there's no evidence attack was sponsored by an unfriendly country or exposed Americans' personal information
@highlight
Vulnerable server was left with its default password and wasn't supposed to be accessible from the Internet
@highlight
House Republicans have subpoenaed the Centers for Medicare and Medicaid Services chief for a September 18 grilling
System down: Healthcare.gov began its online life as a serial punchline after @placeholder couldn't access its signup features and untold numbers were forced to sign up on paper