Chess.com security incident history
Hacking, data breaches and other security incidents involving Chess.com, with related coverage.
Incidents: 3 · Most recent
Profile information of 7.3 million Chess.com users leaked
7.3mImpact: Profile information of 7.3 million users
Profile information of 7.3 million Chess.com users was leaked. Indications that scraping was the cause were presented, and the time of the incident and the response have not been confirmed.
Related reports: 3 →Chess.com file transfer app breach exposes 4,500 people's data
4.5kImpact: Information of 4,500 people
Chess.com suffered a data breach via a file transfer app in June 2025. Chess.com disclosed that the information of 4,500 people was stolen in the incident.
Related reports: 3 →800,000 user records scraped from Chess.com leaked
800kImpact: 800,000 user records
A hacker leaked 800,000 user records collected from Chess.com through scraping. The specific data fields leaked and Chess.com's response have not been confirmed.
Related reports: 2 · last report →