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Response snapshot Oct 27, 2026, 00:06 UTC

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Disclosed incidenthibp-chess2026

Chess.com (2026) breach: 4,653,212 accounts exposed

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.

At a glance

Sources
1 source

What to do

If you or your organization used this service, change reused passwords, watch for phishing that uses the exposed data, and check the disclosure for the organization's guidance.

Read Have I Been Pwned: Chess.com (2026) (opens a new tab)

What happened

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.

Related technology

Sources

  1. Primary source

    Have I Been Pwned: Chess.com (2026) (opens a new tab)

    Verified breach loaded into Have I Been Pwned: account count, exposed data types, and dates.

    Published Checked

  2. Primary source

    Have I Been Pwned breach API (opens a new tab)

    The breach list that supplied this entry.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, September 13). Chess.com (2026) breach: 4,653,212 accounts exposed. https://kevwire.com/record/hibp-chess2026

MLA

"Chess.com (2026) breach: 4,653,212 accounts exposed." KEVWire, 13 Sept. 2026, kevwire.com/record/hibp-chess2026.

Chicago

KEVWire. "Chess.com (2026) breach: 4,653,212 accounts exposed." Last modified September 13, 2026. https://kevwire.com/record/hibp-chess2026.

Evidence summary (plain text)

Chess.com (2026) breach: 4,653,212 accounts exposed (Sep 13, 2026).
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.
Sources:
Have I Been Pwned: Chess.com (2026): https://haveibeenpwned.com/Breach/Chess2026
Have I Been Pwned breach API: https://haveibeenpwned.com/api/v3/breaches
Record ID: hibp-chess2026.
Record origin: Ingested record.
AI evidence: Not assessed.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 23:25 UTC. Ingestion is not an independent editorial investigation.

Verified by Have I Been Pwned. Breach date: 2026-08-03; loaded 2026-09-13. Exposed data: Email addresses, Geographic locations, Names, Usernames. Counts are accounts in the loaded data, not necessarily distinct people.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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