While the Internal Revenue Service has made progressing in addressing weaknesses in its information security controls and improving its internal control over financial reporting, the Government Accountability Office said in a new report that serious weaknesses remain that could affect the confidentiality, integrity and availability of financial and sensitive taxpayer data.

The report acknowledged that the IRS management devoted more attention and resources in fiscal year 2012 to addressing information security controls, and resolved a significant number of the information security control deficiencies that GAO previously reported. Among these efforts, the IRS established cross-functional working groups and tasked them with identifying and remediating specific at-risk control areas. The IRS also improved its controls over the encryption of data transferred between accounting systems, and upgraded critical network devices on the agency's internal network system.

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