340K accounts from BreachForums Version 5 (breachforums.bf) 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 March 2026, a breach of one of the many iterations of the BreachForums hacking forum known as "Version 5" was publicly disclosed. The incident exposed 340k unique email addresses along with usernames and argon2 password hashes.
Source: Have I Been Pwned (CC BY 4.0)