Chess.com

Disclosed Sep 3, 20254,541 affectedConfirmed

Hackers access Chess.com third-party file transfer app, 4,500 users hit

Chess.com said attackers accessed a third-party file transfer application it used between June 5 and 18, 2025, discovered on June 19, affecting just over 4,500 users; no financial data was exposed.

What is known

People affected	4,541 (as reported by the organization)
Disclosed	Sep 3, 2025
Discovered	Jun 19, 2025
Happened	Jun 5, 2025
Attack	Vendor breach
Data exposed	NamesOther
Sector	Gaming · US
Status	Confirmed

Sources

Newsbleepingcomputer.com

Chess.com discloses recent data breach via file transfer app

Official noticeago.vermont.gov

Vermont Attorney General: 2025-09-03 Chess.com Data Breach Notice to Consumers

Official noticein.gov

Indiana Attorney General 2025 data breach report: Chess.com

Notices filed

Residents of VTSep 3, 2025

Vermont AGCount not stated

Residents of INSep 3, 2025

Indiana AG10 people

TotalSep 4, 2025

Research4,500 people

Other breaches at Chess.com

Scraping breachScraping exposed emails, location data and names.4.7M accountsTechUnverifiedSep 13 Scraping breachScraping exposed emails, location data and names.1.3M accountsTechUnverifiedNov 10, 2023

History of this record

records2026-09-25

4500 to 4541by backfillSource

occurred2026-09-25

empty to 2025-06-05by backfillSource

source_type2026-09-25

press to officialby backfillSource

source_url2026-09-25

https://www.bleepingcomputer.com/news/security/chesscom-discloses-recent-data-breach-via-file-transfer-app/ to https://ago.vermont.gov/document/2025-09-03-chesscom-data-breach-notice-consumersby backfillSource

status2026-09-25

disclosed to confirmedby backfillSource

verified_by2026-09-25

empty to vt-agby backfillSource

verified2026-09-25

0 to 1by backfillSource

disclosed2026-09-25

2025-09-04 to 2025-09-03by backfillSource

Added2026-09-25

First recordedby seedSource

First seen 2026-09-25 (Research), confirmed by Vermont AG. Record counts are as reported. Not legal advice.

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