4chan security incident history
Hacking, data breaches and other security incidents involving 4chan, with related coverage.
Incidents: 2 · Most recent
4chan hack raises fears anonymous moderators could be exposed
Internet message board 4chan was hacked. Concerns were raised that the identities of its long-anonymous staff could be exposed, and the specific scale of the leak and response measures have not been confirmed.
Related reports: 4 · last report →4chan hack leaks internal data and knocks site offline
Impact: Internal data leak, service outage and exposure of users' personal information
The online imageboard 4chan was hacked on April 15, 2025, leaking internal data and taking the service down. Access remained disrupted after the attack, and the outage and exposure of users' personal information continued through April 21.
Related reports: 13 · last report →