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Equifax, one of the three major consumer credit reporting agencies, said on Thursday that hackers had gained access to company data that potentially compromised sensitive information for 143 million American consumers, including Social Security numbers and driver’s license numbers.
The attack on the company represents one of the largest risks to personally sensitive information in recent years, and is the third major cybersecurity threat for the agency since 2015.
Equifax, based in Atlanta, is a particularly tempting target for hackers. If identity thieves wanted to hit one place to grab all the data needed to do the most damage, they would go straight to one of the three major credit reporting agencies.
“This is about as bad as it gets,” said Pamela Dixon, executive director of the World Privacy Forum, a nonprofit research group. “If you have a credit report, chances are you may be in this breach. The chances are much better than 50 percent.”
Criminals gained access to certain files in the company’s system from mid-May to July by exploiting a weak point in website software, according to an investigation by Equifax and security consultants. The company said that it discovered the intrusion on July 29 and has since found no evidence of unauthorized activity on its main consumer or commercial credit reporting databases.
In addition to the other material, hackers were also able to retrieve names, birth dates and addresses. Credit card numbers for 209,000 consumers were stolen, while documents with personal information used in disputes for 182,000 people were also taken.
Other cyberattacks, such as the two breaches that Yahoo announced in 2016, have eclipsed the penetration at Equifax in sheer size, but the Equifax attack is worse in terms of severity. Thieves were able to siphon far more personal information — the keys that unlock consumers’ medical histories, bank accounts and employee accounts.
“On a scale of 1 to 10 in terms of risk to consumers, this is a 10,” said Avivah Litan, a fraud analyst at Gartner.
An F.B.I. spokesperson said the agency was aware of the breach and was tracking the situation.