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Data breach

Bithumb groupware hack exposes data of 1,559 customers and staff

First reported · Last reported · 148 related reports

Bithumb announced a breach of its internal mobile system and a personal data leak on October 28. Files containing information on 6,444 customers and 715 employees and partner company staff were exfiltrated through an intrusion into Daou Office, but data on 5,600 customers was encrypted, bringing the confirmed number of people whose personal data was exposed to 1,559, including 844 customers. Some customers' resident registration numbers, bank account numbers and copies of identification documents were exposed, and Bithumb's CEO apologized and pledged assistance and compensation for those affected.

Key facts

Affected organization
Bithumb
Incident type
Data breach
Occurred / detected
2026-10-28
Scale of damage
Personal data of 1,559 people exposed, including 844 customers and 715 employees and partner company staff
Cause / method
Intrusion into internal systems through the external groupware service Daou Office
Location
South Korea

If your data was exposed

View Bithumb notice ↗

Exposed dataNational ID numberID document copyBank account

  1. Turn on deposit and withdrawal alerts in your banking app. You can check all accounts in your name at once and request a payment suspension if needed.Account Info (integrated account management) ↗
  2. Block new mobile phone activations in your name, and register with the Financial Supervisory Service as a person whose personal data was exposed to strengthen identity checks on financial transactions in your name. If a copy of your ID was leaked, consider having it reissued.Identity theft prevention service (M-Safer) ↗Personal data exposure accident prevention system ↗
  3. If you’ve suffered harm, report it. Call 118 (no area code) for privacy violations, contact the police for financial losses, and apply for dispute mediation to seek compensation.Personal Information Infringement Report Center ↗Korean National Police Agency cybercrime report ↗Personal Information Dispute Mediation Committee ↗

Lookup and notice links are official pages found by AI. Make sure the address is on the organization’s official domain before using it.

Timeline

  1. Bithumb announced a breach of its internal mobile system and a personal data leak, saying it was analyzing who and what information had been affected.
  2. The exfiltration of files on 6,444 customers and 715 employees and partner company staff was confirmed, and Bithumb's CEO apologized and pledged assistance and compensation for those affected.
  3. Data on 5,600 customers was encrypted, narrowing the confirmed number of people whose personal data was exposed to 1,559: 844 customers and 715 employees and other staff.
  4. Financial authorities urged security measures concerning Daou Office, which had been identified as the entry point, and the Financial Supervisory Service shared the relevant vulnerability with the financial sector.

148 related reports

The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organization’s official statements for accurate details.