7.09M accounts from Xiaomi (xiaomi.cn) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesIP addressesPasswordsUsernames
In August 2012, the Xiaomi user forum website suffered a data breach. In all, 7 million email addresses appeared in the breach although a significant portion of them were numeric aliases on the bbs_ml_as_uid.xiaomi.com domain. Usernames, IP addresses and passwords stored as salted MD5 hashes were also exposed. The data was provided with support from dehashed.com. Read more about Chinese data breaches in Have I Been Pwned.
Source: Have I Been Pwned (CC BY 4.0)