Chess.com (2026) Data Breach Exposes 4,653,212 User Records

We publish these pages from public notices and reporting so you can understand what was exposed. Everything here is already public. Always confirm with the organization named in your notice.

What happened

According to public breach records, the Chess.com (2026) data breach on 2026-08-03 is reported to have exposed the personal information of 4,653,212 accounts.

In August 2026, millions of records allegedly sourced from Chess.com were posted online. The data contained 7.3M rows with 4.6M unique email addresses, along with usernames, names, countries and data relating to users' Chess.com accounts. Analysis of the data suggested it had been obtained by scraping. When loaded into HIBP, 99% of the email addresses had already appeared in previous data breaches, further supporting the scraping theory. Read more about scrapes and data breaches.

• Change your password immediately if you have an account with Chess.com (2026).
• Enable two-factor authentication on any accounts using the same email address.
• Monitor your accounts for suspicious activity and unauthorized access.
• Watch for phishing attempts using your exposed personal information.
• Consider using a password manager to generate unique passwords for each service.

What data was exposed

The following types of personal data were compromised:

• Email addresses
• Geographic locations
• Names
• Usernames

Breach details

This summary is compiled from public breach-notification data and known leak databases. Figures reflect what those sources report and may be revised as more is learned. If something here looks wrong or you think your information is involved, contact our support team.

We report breaches as a factual record to help people check their exposure. Inclusion here is not an allegation of wrongdoing or negligence by Chess.com (2026); it reflects a publicly reported security incident.

What to do now

Based on the data exposed in this breach, here are the steps you should take:

• Change your Chess.com (2026) password immediately, and change it anywhere you reused the same credentials.
• Enable two-factor authentication on your Chess.com (2026) account and any other account that shared that password.
• Watch for targeted phishing emails, as your personal information could be used to craft convincing scam messages.
• Monitor your financial accounts and credit reports for signs of unauthorized activity.
• Consider using a password manager to ensure each account has a unique, strong password.