Citigroup says 360,000 affected by hackers

Jun 16, 2011

Hackers stole account information of more than 360,000 of Citigroup Inc.'s U.S. credit card customers in a recent data breach, the bank said Wednesday, almost double the number initially thought.

Citi said last week that about 1 percent of its credit card customers had information hacked online but did not say exactly how many. The actual number of customers affected was thought to be about 200,000, based on Citi's 2010 annual report, which said the company had roughly 21 million North American customers.

But the true number was actually 360,083, the bank said in a statement posted on its website late Wednesday.

The bank said it discovered on May 10 that hackers used its Account Online system to access the data for North America Citi-branded credit cards issued in the U.S.

The bank said last week that hackers accessed customer names, account numbers and contact information, including e-mail addresses.

But they weren't able to get their hands on , dates of birth, card expiration dates or card security codes, information that can be useful in identity theft.

Internal fraud alerts and enhanced monitoring were placed on all accounts deemed at risk as soon as the breach was discovered, Citi said.

Letters were sent starting June 3 to people affected, and 217,657 customers have also been sent new cards, Citi said. Replacement cards were not sent to the others because the accounts were closed or they had already been sent new cards for other reasons.

Citi said it has notified police and .

"For the security of our customers, and because of the ongoing law enforcement investigation, we cannot disclose further details regarding how the data breach occurred," it said.

Citi reassured customers that they weren't liable for any unauthorized use of their cards and urged them to review account statements to report any suspicious transactions.

It's the latest in a series of high-profile data attacks against big companies and institutions. The International Monetary Fund said Sunday that it was investigating an attack on its computer system.

Google Inc. said earlier this month that Gmail accounts of several hundred people had been breached. In April, Sony Corp.'s Playstation Network was the victim of a massive security breach that affected more than 100 million online accounts.

Explore further: Google to help boost Greece's tourism industry

not rated yet
add to favorites email to friend print save as pdf

Related Stories

Latest data breach strikes at financial security

Jun 11, 2011

(AP) -- Citigroup's disclosure that the names, account numbers and email addresses of 200,000 of its credit card customers were stolen strikes at the core of modern-day financial life - the ways people buy ...

Sony says 25 million more accounts hacked

May 03, 2011

Sony Corp. said Monday that hackers may have taken personal information from an additional 24.6 million user accounts after a review of the recent PlayStation Network breach found an intrusion at a division that makes multiplayer ...

US banks, companies issue warning after email hack

Apr 04, 2011

Computer hackers gained access to the email addresses of customers of several large US banks and other companies in a potentially huge data breach at US online marketing firm Epsilon. ...

More Sony websites hacked, 8,500 Greek accounts hit

May 24, 2011

Sony on Tuesday said its websites in three countries had been hacked with 8,500 Greek user accounts compromised, in a blow to efforts to restore confidence after a huge data breach affecting millions.

Recommended for you

Fitbit to Schumer: We don't sell personal data

4 hours ago

The maker of a popular line of wearable fitness-tracking devices says it has never sold personal data to advertisers, contrary to concerns raised by U.S. Sen. Charles Schumer.

Should you be worried about paid editors on Wikipedia?

8 hours ago

Whether you trust it or ignore it, Wikipedia is one of the most popular websites in the world and accessed by millions of people every day. So would you trust it any more (or even less) if you knew people ...

How much do we really know about privacy on Facebook?

9 hours ago

The recent furore about the Facebook Messenger app has unearthed an interesting question: how far are we willing to allow our privacy to be pushed for our social connections? In the case of the Facebook ...

Philippines makes arrests in online extortion ring

9 hours ago

Philippine police have arrested eight suspected members of an online syndicate accused of blackmailing more than 1,000 Hong Kong and Singapore residents after luring them into exposing themselves in front of webcam, an official ...

Google to help boost Greece's tourism industry

22 hours ago

Internet giant Google will offer management courses to 3,000 tourism businesses on the island of Crete as part of an initiative to promote the sector in Greece, industry union Sete said on Thursday.

Music site SoundCloud to start paying artists

Aug 21, 2014

SoundCloud said Thursday that it will start paying artists and record companies whose music is played on the popular streaming site, a move that will bring it in line with competitors such as YouTube and Spotify.

User comments : 0