Two top Equifax execs are out after a massive hack that exposed 143 million Americans' financial data

Equifax's top information-security executives are leaving the credit-reporting company after a data breach that exposed the personal financial information of 143 million Americans.

The consumer-data firm's CIO, David Webb, and its chief security officer, Susan Mauldin, are "retiring" a week after Equifax announced the cyber attack that has been called one of the worst such data breaches in US history.

Webb will be replaced by Mark Rohrwasser, who joined the company last year, Equifax said in an emailed statement. Mauldin will be replaced by Russ Ayres. Both Rohrwasser and Ayers have previously worked in Equifax's IT division.

The hack occurred between mid-May and July, Equifax said when it first disclosed the break in last week.

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Credit reporting company Equifax Inc. corporate offices are pictured in Atlanta, Georgia, U.S., September 8, 2017. REUTERS/Tami Chappell
LONDON, ENGLAND - AUGUST 19: A detail of the Ashley Madison website on August 19, 2015 in London, England. Hackers who stole customer information from the cheating site AshleyMadison.com dumped 9.7 gigabytes of data to the dark web on Tuesday fulfilling a threat to release sensitive information including account details, log-ins and credit card details, if Avid Life Media, the owner of the website didn't take Ashley Madison.com offline permanently. (Photo by Carl Court/Getty Images)
Katherine Archuleta, director of the U.S. Office of Personnel Management (OPM), speaks during a House Oversight and Government Reform Committee hearing on the OPM data breach in Washington, D.C., U.S., on Wednesday, June 24, 2015. U.S. senators said yesterday they doubt the government's personnel office understands the breadth of a computer hack that exposed the records of more than 4 million federal workers, or that the agency can stop another breach. Photographer: Andrew Harrer/Bloomberg via Getty Images
WASHINGTON, DC - JUNE 05: The entrance to the Theodore Roosevelt Federal Building that houses the Office of Personnel Management headquarters is shown June 5, 2015 in Washington, DC. U.S. investigators have said that at least four million current and former federal employees might have had their personal information stolen by Chinese hackers. (Photo by Mark Wilson/Getty Images)
SCHAUMBURG, IL - AUGUST 04: A statue of a horse stands at the entrance to a P.F. Chang's restaurant on August 4, 2014 in Schaumburg, Illinois. P.F. Chang's China Bistro Ltd. said today that the company experienced a data breach involving customers' credit and debit card information which affected 33 restaurants in 16 states, including the Schaumburg, Illinois location. (Photo by Scott Olson/Getty Images)
PORTLAND, ME - AUGUST 15: Shaws on Congress Street on Friday, July 15, 2014. Shaws parent company is investigating a possible data breach. (Photo by Logan Werlinger/Portland Press Herald via Getty Images)
COLMA, CA - APRIL 18: Customers enter a Michaels art and crafts store on April 18, 2014 in Colma, California. Michaels, the largest arts and crafts chain in the U.S., announced that an estimated 2.6 million cards used at its stores across the country may have been affected by a security breach. Aaron Brothers, a subsidiary of Michaels, was also affected by the breach. (Photo by Justin Sullivan/Getty Images)
CORAL GABLES, FL - FEBRUARY 28: A checkout keypad is seen at a Sears store on February 28, 2014 in Coral Gables, Florida. According to reports the U.S. Secret Service is investigating a possible digital attack at Sears Holdings Corp. (Photo by Joe Raedle/Getty Images)
A couple of shoppers leave a Target store on a rainy afternoon in Alhambra, California on December19, 2013, as the US retail giant said some 40 million customers may have had bank card data compromised by hackers who broke into its database as holiday shopping got underway. Target said there had been 'unauthorized access' to its payment system in US stores affecting credit and debit cards with approximately 40 million credit and debit cards possibly affected by the breach between November 27 and December 15, the company said in a statement. AFP PHOTO / Frederic J. Brown (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
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The company said criminals had accessed details including names and social security numbers. Credit card numbers for about 209,000 people, and certain documents for another 182,000 were also accessed. Equifax has set up a website to help people figure out if they are among those whose information was compromised.

The company said there was no evidence of a breach into its core consumer or commercial credit reporting databases, and has since admitted that the source of the breach was a software flaw that could have been prevented.

Three Equifax executives sold nearly $2 million in company stock just days after the breach. The company said the executives "had no knowledge" of the incident beforehand, according to an emailed statement from the credit-monitoring agency.

Some US lawmakers have called for an investigation of the breach, with Equifax's CEO expected to testify before Congress over the matter, and the company's shares have plunged in the days since it was disclosed.

The breach could be one of the biggest in the United States, Reuters reported. Last December, Yahoo said more than one billion user accounts were compromised in August 2013, while in 2014 eBay had urged 145 million users to change their passwords following a cyber attack.

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