I opened my Stack Overflow account after almost 18 days today.
I didn't bounty on this question, and what next should I do for security concerns? How can I revoke my points?
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We see this from time to time. The most likely scenario is you were using the same password as on another site that was hacked and that password was made available on password dumps. Another scenario we've seen is people obtained these e-mails and passwords through a scam.
The latest one that occurred on Sep 5 had e-mails from the accounts involved be in the Have I Been Pwned? database (You can check your own e-mail and password there and verify). We will invalidate credentials as needed when this happens - but what I can recommend is: change your password and do not use the same password on two different sites, make it unique. Otherwise, if one of the sites gets breached, all your accounts that share an e-mail & password are now at risk.
I will be checking with our devs with regards to reversing these bounties from Sep 5 - it's likely we can do it so I'll update here when it's done.
The bounty on this question was started by the hacker on September 5th, and has already expired, so you cannot get your points back. I advise changing the password on all your accounts currently using the hacked password, make the new one more secure by adding various special characters, numbers etc., and be sure to keep it safe.