7.49M accounts from uuu9 (uuu9.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsUsernames
In September 2016, data was allegedly obtained from the Chinese website known as uuu9.com and contained 7.5M accounts. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese breach it has been flagged as "unverified". The data in the breach contains email addresses and user names. Read more about Chinese data breaches in Have I Been Pwned.
Source: Have I Been Pwned (CC BY 4.0)