Electioneers greet voters outside the Hamilton County Government Center during early voting in Noblesville, Ind. in 2018.

Four federal agencies, including the Department of Homeland Security’s Cybersecurity and Infrastructure Security Agency, issued a report to states saying electronic ballot return technologies are vulnerable to hacking. Delaware is one of three states piloting a cloud-based voting system for people with disabilities and others who have requested absentee ballots in the July primary.