San Francisco (AFP) – A massive security breach that hit Equifax has cost the US credit bureau nearly $90 million so far, a figure that is set to rise further, its chief financial officer said on Thursday. The company, which gathers data on consumers to help lenders determine borrowers' creditworthiness, revealed in September that hackers had stolen the personal details, including names, dates of birth and social security numbers, of nearly 146 million people. In the third quarter, "we incurred a one-time charge related to the cybersecurity incident of $87.5 million," John Gamble said during a conference call on quarterly results. Equifax is forecasting between $60 and $75 million in spending that will include information technology security in the fourth quarter, he said. In addition to the expenses, the group's earnings have also been affected, particularly due to customer dissatisfaction, Equifax said. Its net income fell 27 percent to $96.3 million in the third quarter.