Hackers used the vulnerability to copy the personal information of account holders. On June 2, PokerStars was made aware of a vulnerability within a piece of software the company uses to encrypt and transfer files, MOVEit. PokerStars is one of the many companies that fell victim to a security breach in May. More than 110,000 PokerStars players who opened accounts in Pennsylvania, Michigan and New Jersey are impacted and should take action to protect themselves, says PokerStars. PokerStars players in the United States began receiving letters this week notifying them of a “cybersecurity incident” that exposed their names, addresses, and social security numbers to hackers. How Much Money Can You Make Playing Poker?.