BreachForums Version 5 data breach: 339K accounts exposed
Severity: high · Patch status: no-fix-needed · Since 2026-03-27
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. Exposed data: email addresses, passwords, usernames. The breach dates from Mar 26, 2026; Have I Been Pwned loaded it on Mar 27, 2026.
What to do
- If you had a BreachForums Version 5 account, change its password and the password of any other account that reused it.
- Turn on multi-factor authentication wherever it is offered.
- Check whether your addresses are in this breach at https://haveibeenpwned.com.
- Expect targeted phishing that quotes the leaked details; verify any unexpected contact out of band.
Sources
All live incidents on Threat Watch