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Bithumb staff groupware breach

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Made public

What leaked7

Hard to replace

  • ID card image
  • Driver's licence number
  • Bank account number
  • Mobile number
  • Email address

Permanent

  • Resident registration number
  • Full name
  • ID card imageitems vary by customer · 844 customers; 715 staff also affected
  • Resident registration numberitems vary by customer · 844 customers; 715 staff also affected
  • Driver's licence numberitems vary by customer · 844 customers; 715 staff also affected
  • Bank account numberitems vary by customer · 844 customers; 715 staff also affected
  • Mobile numberitems vary by customer · 844 customers; 715 staff also affected
  • Email addressitems vary by customer · 844 customers; 715 staff also affected
  • Full nameitems vary by customer · 844 customers; 715 staff also affected

To-dos8 · about 1 h in all

  1. Block new loans and cards in your nameabout 10 minStops: loans or cards in your name · Limits harm from: scam calls (opens in a new tab)
  2. Block non-face-to-face account opening in your nameabout 10 minStops: bank account in your name · Limits harm from: scam calls (opens in a new tab)
  3. Register as an exposed person with the FSSabout 10 minLimits harm from: scam calls, loans or cards in your name, bank account in your name (opens in a new tab)
  4. Know the scam pattern: calls and texts that cite these leaked detailsabout 5 minfreeLimits harm from: scam calls, phishing messages
  5. Check your credit records and block status on credit4uabout 10 minfreeHelps you notice: loans or cards in your name (opens in a new tab)
3 more
  1. Block new mobile lines in your name with Msaferabout 10 minfreeStops: phone line in your name (opens in a new tab)
  2. Report the lost resident ID card on Gov24about 5 minLimits harm from: bank account in your name, phone line in your name (opens in a new tab)
  3. Check every phone line in your name on Msaferabout 5 minfreeHelps you notice: phone line in your name (opens in a new tab)

What happened next12 events

  1. UndetectedNone on record
  2. Response 9 eventsNo individual notice on record · show events
  3. Remedy 1 eventOngoing · show events
  4. Penalty 2 eventsOngoing · Back to latest
  5. DisputesNone on record

Penalty: 2 events

Back to latest
  1. FSC emergency meeting: Bithumb reported signs that data of staff at Bithumb, its subsidiaries and partner firms leaked; user data still being checked
  2. FSC, FSS and Financial Security Institute began on-site investigations
Company
Bithumb
Company detected it
Made public
Notice
Leak confirmed

How the facts developed

  1. Bithumb's statement (reported by the press on October 29, 2026): names, mobile numbers, email addresses, resident registration numbers, driver's licence numbers, account numbers and ID card copies of 844 customers leaked, with different items for each customer
  2. FSC release: Bithumb reported signs that data of employees of Bithumb, its subsidiaries and partner firms leaked after abnormal outside access to a system that supports staff work; whether user data leaked is still being checked, and no leak of wallet addresses or other data usable for unauthorised payments or crypto transfers has been found so far

Sources