# Bithumb Discloses Hack of Employee System as Attackers Breach 16 South Korean Financial Institutions

South Korea's Financial Services Commission counts about 100,000 data breaches so far, Daishin Securities says about 38,490 customers were affected, and Coinbase separately says a breach at analytics vendor Amplitude exposed some customer contact details.

- Published: 2026-10-28T05:45:35.192Z
- Canonical: https://polylog.news/crypto/2026-10-28/bithumb-discloses-hack-of-employee-system-as-attackers-breac
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [CoinDesk](https://www.coindesk.com/tech/2026/10/28/bithumb-hacked-through-employee-system-as-south-korean-financial-firms-face-cyberattacks), [Polylog editors](https://polylog.news), [The Star (Reuters)](https://www.thestar.com.my/tech/tech-news/2026/10/28/three-south-korean-financial-firms-including-bithumb-report-data-breaches-yonhap-says), [Cointelegraph](https://cointelegraph.com/news/bithumb-discloses-data-leak-after-internal-system-breach-report), [CoinDesk (Coinbase)](https://www.coindesk.com/tech/2026/10/28/coinbase-says-customer-funds-are-safe-after-third-party-vendor-exposes-customer-contact-info)

Bithumb, one of South Korea's two largest crypto exchanges, said attackers breached an internal mobile system that its employees use to communicate, CoinDesk reports. Bithumb found the intrusion on Tuesday and reported it the same day to th…

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