Dear Auntie Imperial,

We are writing to let you know that we recently discovered that some user data 
was compromised as a result of unauthorized access to our systems by a 
malicious third party. We are very sorry for any concern or inconvenience this 
may cause. We are working rapidly to investigate the situation further and take 
the appropriate steps to prevent such incidents in the future.

What Happened

On Friday we discovered that some user data was compromised by a third party 
who gained unauthorized access to our systems. We're still investigating the 
precise causes and in addition to the work being conducted by our internal 
security teams, we have retained a leading digital forensics and security firm 
to assist us. We have also notified law enforcement officials.

While the investigation is still ongoing, we have already taken steps to 
contain the incident, and our efforts to protect our users and prevent this 
type of incident from happening in the future are our top priority as a company.

What information was involved

The following information of yours may have been compromised:

Account and user information, e.g. name, email, IP, user ID, encrypted 
password, user account settings, personalization data

Public actions and content including drafts, e.g. questions, answers, comments, 
blog posts, upvotes

Data imported from linked networks when authorized by you, e.g. contacts, 
demographic information, interests, access tokens (now invalidated)

Non-public actions, e.g. answer requests, downvotes, thanks

Questions and answers that were written anonymously are not affected by this 
breach as we do not store the identities of people who post anonymous content.

What we are doing

While our investigation continues, we're taking additional steps to improve our 
security:

We’re in the process of notifying users whose data has been compromised.

Out of an abundance of caution, we are logging out all Quora users who may have 
been affected, and, if they use a password as their authentication method, we 
are invalidating their passwords.

We believe we’ve identified the root cause and taken steps to address the 
issue, although our investigation is ongoing and we’ll continue to make 
security improvements.

We will continue to work both internally and with our outside experts to gain a 
full understanding of what happened and take any further action as needed.

What you can do

We’ve included more detailed information about more specific questions you may 
have in our help center, which you can find here.

While the passwords were encrypted (hashed with a salt that varies for each 
user), it is generally a best practice not to reuse the same password across 
multiple services, and we recommend that people change their passwords if they 
are doing so.

Conclusion

It is our responsibility to make sure things like this don’t happen, and we 
failed to meet that responsibility. We recognize that in order to maintain user 
trust, we need to work very hard to make sure this does not happen again. 
There’s little hope of sharing and growing the world’s knowledge if those doing 
so cannot feel safe and secure, and cannot trust that their information will 
remain private. We are continuing to work very hard to remedy the situation, 
and we hope over time to prove that we are worthy of your trust.

The Quora Team
 


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