Wisconsin officials say they have taken multiple steps in recent months to guard against the type of attack that Russian hackers unleashed on Illinois when they allegedly stole data from hundreds of thousands of Illinois voters before the 2016 election. But the August rollout of vote tallying through the WisVote system — in which clerks inadvertently reported duplicate votes in nine counties — shows more work needs to be done. In 2016, cyber actors gained access to 200,000 voter records in Illinois, according to an April report from FireEye, a California-based cybersecurity firm.
“Illinois maintains that no data was altered; however, it is possible that the actors had the ability to the modify or delete data,” the report said.
A July indictment by Special Counsel Robert Mueller put the number even higher, saying Russian hackers gained access to information about 500,000 voters in that breach, including “names, addresses, partial Social Security numbers, dates of birth and driver’s license numbers.”