Today, Yahoo! Japan official blog published the follow-up announcement [J] of the possible 22 million account name leaks on 17th.
According to it, further investigation reached the conclusion that more data beyond account name could be brought out for 1.486 million accounts. The data are non-decrypt-able password (password hash, I guess) and information used when you reset password.
To protect those users account, Yahoo! Japan temporarily turned off the password reset feature, which asks user’s secret questions, 19 p.m. tonight. The relevant users will get their password and secret questions reset in early morning 24th.
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