JPMorgan Chase & Co. (NYSE: JPM) revealed on Thursday that the largest bank in the US has been inflicted with a massive cyber-attack. According to news sources, hackers were able to infiltrate JPMorgan’s server through the exploitation of an employee’s password. The cyber-attack was deemed one of the largest cyber-attacks in history.

The revelation of the attack was first noticed several months ago, in August when it was discovered that seven of the country’s largest banks’ servers were hacked using sophisticated malware software that tunneled its way into the banks’ computer systems.

The latest attack affected approximately 76 million personal accounts and seven million small business accounts. JPMorgan also released the details of the extent of the security breach.

The bank reassured customers that the only information that was compromised was account holders’ name and their contact information. JPMorgan also reassured customers that there was no evidence that any account numbers, passwords or sensitive information were accessed or taken. JPMorgan has told to customers with hacked accounts that they will not be liable for any unauthorized transactions so long as they alert the bank in a timely fashion.

JPMorgan further calmed their customers by stating that there has not been any fraudulent activities relating to the cyber-attack. Even though, the hackers have not been able to access customers’ accounts, the hackers still stand to make a profit by selling the stolen information to spammers or other hackers/hacking groups.

Internally, JPMorgan’s COO, Matt Zames, has now urged employees to be more mindful at work; making sure that employees are consistently changing their passwords, logging off their workstations when they are away from their desk among other things. Currently, the cyber-attack is still under investigation by the Federal Bureau of Investigation and other agencies.