The Department of Homeland Security has designated the U.S. voting infrastructure as critical infrastructure.

A hacker offered to sell an unpatched system vulnerability in the U.S. Election Assistance Commission website on the Dark Web for “thousands” of dollars.

The Federal Bureau of Investigation’s Cyber Division warned election officials nationwide this month to fortify their systems in the wake of two breaches it was able to detect earlier this summer. A “flash” warning sent by the agency about 10 days ago warned state boards of election to take the necessary precautions to safeguard their...