An automated attack on the IRS’ computer systems in January used stolen personal data to create fake logins through the agency’s Electronic Filing PIN service.
About 464,000 Social Security numbers were used in the attack on the IRS.gov system, the agency said late Tuesday, and 101,000 of those numbers allowed the attackers to get at an E-file PIN. The PIN can be used to electronically file a tax return.
Read the complete report here.