Chess.com (2026) data breach (2026-08-03) — 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.
- Published by source
- 2026-09-13
- First seen by Reality Radar
- 2026-10-20
- Last verified
- 2026-10-20
Affected
- Manufacturer
- Chess.com (2026)
- Products
- Chess.com (2026)
Whether your exact unit is affected depends on the model, serial number and region in the official notice.
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Sources
- Have I Been Pwned — breach catalogue Tier B published 2026-09-13
Evidence ledger
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