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Quora reveals data breach affecting up to 100 million users

04 December 2018

For about 327 million of the total 500 million affected, the compromised information included data such as names, mailing addresses, phone numbers, email addresses, passport numbers, Starwood Preferred Guest account information, date of birth, gender, arrival and departure information, reservation date and communication preferences.

Non-public content and activity, e.g. direct messages or answer requests.

It's worth noting that if you've used and answered questions anonymously in the past, your data is safe as Quora doesn't store the identities of such users.

"For approximately 100 million Quora users, the following information may have been compromised", D'Angelo wrote. There has been no official confirmation yet as to what linked data Quora imports from social logins from popular social networks like Facebook and Twitter.

Quora says the latest data breach is unlikely to result in identity theft as it does not collect sensitive private information of users.

"We recently became aware that some user data was compromised due to unauthorised access to our systems by a malicious third party", it began.

"We have retained a leading digital forensics and security firm to assist us", it said.

Quora relies on the website traffic that comes from people searching questions in their browsers. The number of people involved potentially affected by the breach of the reservation database made it one of the largest ever cyberattacks on a company.

The service has logged out all affected users, and in the event they use passwords to authenticate, old passwords have been invalidated. Users of the content blocker uBlock Origin may use it to access Quora content without account. Those wishing to delete their account can do so in the settings section and the deactivation will happen immediately. "We have already taken steps to ensure the situation is contained, and we are working to prevent this type of event from happening in the future".

If you think you have a Quora account, the best thing to do is change your password.

The company said it is in the process of notifying users whose data have been compromised.

Quora reveals data breach affecting up to 100 million users