Source (from the posted article):

During a House hearing into the cyberattack in April, UnitedHealth’s CEO Witty confirmed that the cybercriminals broke into one of its employee systems using stolen credentials that were not protected with multi-factor authentication (MFA), a security feature that can help to protect against the misuse of password theft.

Link to the referenced article: https://www.nytimes.com/2024/03/11/nyregion/synagogue-protest-teaneck-nj.html

Relevant quote from the article:

Since then, tensions — and fears — have only escalated, said Hillary Goldberg, a member of the township council, who has been a vocal supporter of Israel and critic of the walkout. “I have been threatened; I had a box truck with my picture on it and the words ‘liar liar’ driven around town; my house has been broken into; I have received antisemitic messages,” she said in an email. She added, “I have never felt so afraid to be Jewish as now,” she said.