298K accounts from Carding Mafia (March 2021) (cardmafia.cc) 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 March 2021, the Carding Mafia forum suffered a data breach that exposed almost 300k members' email addresses. Dedicated to the theft and trading of stolen credit cards, the forum breach also exposed usernames, IP addresses and passwords stored as salted MD5 hashes.
Source: Have I Been Pwned (CC BY 4.0)