Federal officials have been lucky until now, but the Affordable Care Act’s Internet web portal could become a hacker’s playground — with plenty of sensitive data compromised — without a significant tightening of security, according to a new report by the Government Accountability Office.

The new warning comes on the sixth anniversary of the enactment of the ACA and addresses security problems related to the personal information — including names, addresses, Social Security numbers and sensitive income and tax details — of literally millions of Americans who have enrolled in the insurance program online through HealthCare.gov.

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