This site, featured previously on MUO, is a searchable database of data from all of the biggest hacks.

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The point is that the leak includes data that could be yours. If you’re the owner of a Hotmail, Outlook, Gmail, Yahoo Mail or account, you’re probably thinking that right about now is the best time to change your account password. Renowned security researcher Professor Alan Woodward told the BBC that “there was ‘no need to panic’ or for people to change their passwords at this point.”Now, we’re not saying that you shouldn’t change your password; you’re free to do so at any time, as it is your account.

However, if the breach is as serious as it is being claimed, your webmail provider will be requiring you to change your password the next time you attempt to login. Woodward is being quite canny here, advising users to wait for instructions from their webmail provider. Well, for a start off, it’s Gmail, Hotmail/Outlook, Yahoo Mail and who have the resources to investigate the legitimacy of the breach, and it is those companies who have the power to initiate mass password resets.

The hackers were able to obtain usernames, email addresses, scrambled passwords, and birthdays.

Some of the forums allowed the hackers to also obtain IP addresses (which could be used to determine location) and phone numbers.

Meanwhile, if the account is now unused, it’s worth closing it. The story behind this leak seems shrouded in mystery.

Hold Security’s blog post on the matter suggests that they were contacted anonymously with over 900 million credentials collected from multiple breaches over a period of time, a 10 gigabyte file in total. How can anyone make use of 10 gigabytes worth of leaked email credentials?

This is the latest hack in a long line of similar attacks on out-of-date and unpatched forums with widely known and glaring security flaws.

Many of Mail.ru's forums ran versions of v Bulletin software dating back to early-2013.

Back in 2014, Hold Security attempted to cash in on the breach it reported that time around, offering a subscription service to website owners (but not individuals).

Some researchers claim that their previous moment in the spotlight was a case of style over substance, but Holden denied this was the case, claiming to be “actually losing money.

However this is a far more serious issue than has been portrayed in the press, with considerable implications for user safety.