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Daishin Securities customer data breach

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Made public · 38,490 people

What leaked6

Hard to replace

  • Bank account number
  • Mobile number
  • Home or delivery address
  • Email address
  • Username

Permanent

  • Full name
  • Bank account numberbank name; deposit and withdrawal account number · encrypted; Daishin securities account number · encrypted
  • Mobile numberencrypted
  • Full namecustomers; items differ from person to person
  • Usernametrading login ID

To-dos4 · about 45 min in all

  1. Know the scam pattern: calls and texts that cite these leaked detailsabout 5 minfreeLimits harm from: scam calls, phishing messages
  2. Register as an exposed person with the FSSabout 10 minLimits harm from: scam calls (opens in a new tab)
  3. Block new loans and cards in your nameabout 10 minLimits harm from: scam calls (opens in a new tab)
  4. Remove your address and phone from public profiles and tighten SNS privacyabout 20 minfreeLimits harm from: visits or contact at home

What happened next10 events

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

Penalty: 1 event

Back to latest
  1. FSC: a customer data leak was also confirmed during the investigation of the Daishin incident; FSS and the Financial Security Institute to investigate closely
Company
Daishin Securities
Company detected it
Made public
Notice
Leak confirmed
Affected
38,490 people · company notice

How the facts developed

  1. Company notice: an illegal access attempt from outside was detected on October 17, 2026, and the investigation found on October 26, 2026 that personal (credit) data had leaked; 38,490 people so far

Sources