Rambler Data Breach (2014)
In late 2016, a data dump of almost 100M accounts from Rambler, sometimes referred to as "The Russian Yahoo", was discovered being traded online. The data set provided to Have I Been Pwned included 91M unique usernames (which also form part of Rambler email addresses) and plain text passwords. According to Rambler, the data dates back to March 2014.
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