70.8M accounts from Naz.API were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
In September 2023, over 100GB of stealer logs and credential stuffing lists titled "Naz.API" was posted to a popular hacking forum. The incident contained a combination of email address and plain text password pairs alongside the service they were entered into, and standalone credential pairs obtained from unnamed sources. In total, the corpus of data included 71M unique email addresses and 100M unique passwords.
Source: Have I Been Pwned (CC BY 4.0)