A cyberattack this summer on JPMorgan Chase compromised more than 76 million household accounts and 7 million small-business accounts, making it among the largest corporate hacks ever discovered. |
The latest revelations, which were disclosed in a regulatory filing on Thursday, vastly dwarf earlier estimates that hackers had gained access to roughly 1 million customer accounts. |
The new details about the extent of the hack — which began in June but was not discovered until July — sent JPMorgan scrambling for the second time in just three months to contain the fallout. |
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