Hackers Accessed Dozens of JPMorgan Servers

The headache caused by the attack on JPMorgan Chase’s computer network this summer may not go away anytime soon. Over two months, hackers gained entry to dozens of the bank’s servers, said three people with knowledge of the bank’s investigation into the episode who spoke on the condition of anonymity. This, they said, potentially gave the hackers a window into how the bank’s individual computers work.