Chess.com
Disclosed Sep 3, 20251 year ago4,541 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 | Names, Other |
| Sector | Gaming · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| Chess.com discloses recent data breach via file transfer appbleepingcomputer.com · News | News |
| Vermont Attorney General: 2025-09-03 Chess.com Data Breach Notice to Consumersago.vermont.gov · Official notice | Official notice |
| Indiana Attorney General 2025 data breach report: Chess.comin.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| Vermont AGresidents of VT | Sep 3, 2025 | |
| Indiana AGresidents of IN | Sep 3, 2025 | 10 |
| Researchtotal | Sep 4, 2025 | 4,500 |
Other breaches at Chess.com
| Breach | Affected | ||||
|---|---|---|---|---|---|
| Disclosed Sep 13, 2026Sep 1312 days agoScrapingUnverified | Sep 1312 days ago | Scraping | Tech | Unverified | 4.7Macct |
| Disclosed Nov 10, 2023Nov 10, 20232 years agoScrapingUnverified | Nov 10, 20232 years ago | Scraping | Tech | Unverified | 1.3Macct |
History of this record
- 2026-09-25 · records: 4500 to 4541 · backfill source
- 2026-09-25 · occurred: empty to 2025-06-05 · backfill source
- 2026-09-25 · source_type: press to official · backfill source
- 2026-09-25 · source_url: 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-consumers · backfill source
- 2026-09-25 · status: disclosed to confirmed · backfill source
- 2026-09-25 · verified_by: empty to vt-ag · backfill source
- 2026-09-25 · verified: 0 to 1 · backfill source
- 2026-09-25 · disclosed: 2025-09-04 to 2025-09-03 · backfill source
- 2026-09-25 · added · seed source
First seen 2026-09-25 (Research), confirmed by Vermont AG. Record counts are as reported. Not legal advice.