(CBS News) A top HealthCare.gov security officer told Congress there have been two, serious high-risk findings since the website’s launch, including one on Monday of this week, CBS News has learned.

Teresa Fryer, the chief information security officer for the Centers for Medicare and Medicaid Services (CMS), revealed the findings when she was interviewed Tuesday behind closed doors by House Oversight Committee officials. The security risks were not previously disclosed to members of Congress or the public. Obama administration officials have firmly insisted there’s no reason for any concern regarding the website’s security.

The Department of Health and Human Services (HHS) responded to questions about the security findings in a statement that said, “in one case, what was initially flagged as a high finding was proven to be false. In the other case, we identified a piece of software code that needed to be fixed and that fix is now in place. Since that time, the feature has been fully mitigated and verified by an independent security assessment, per standard practice.”

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