A hacker breached HealthCare.gov in July and uploaded malicious software, apparently intending to use the system in future cyberattacks against other websites. 

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The break-in, first reported by The Wall Street Journal, was discovered last week by federal health officials, who said no personal data was taken.

It is the first successful, confirmed hack of the federal health insurance exchange that went through a rocky launch last year.

According to the Department of Health and Human Services (HHS), agency officials noticed a problem with one of the test servers used by the ObamaCare website last week. The FBI and Department of Homeland Security were called in to investigate the attack.