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Data breach

Day1 Company hack leaks students' and instructors' personal data

First reported · Last reported · 11 related reports

In June 2026, personal data was leaked in a hack of Day1 Company, the operator of Fast Campus, and damage to information on instructors and employees of Samsung, LG and Kakao was also confirmed. The leaked items included passwords and phone numbers, and a further leak of card and account information later came to light. Day1 Company said early on that it was assessing the scale of the damage, and criticism was later raised over its response and lack of communication.

Key facts

Affected organization
Day1 Company
Incident type
Data breach
Occurred / detected
Not confirmed
Scale of damage
Not confirmed
Cause / method
Hacking
Location
South Korea

If your data was exposed

View Day1 Company notice ↗

Exposed dataPhone numberPasswordCard detailsBank account

  1. Change your password, and also change it on any other site where you use the same one. Turn on two-factor authentication if available.
  2. Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organization’s official website or app.
  3. Turn on payment alerts in your card issuer’s app, and if you see a charge you don’t recognize, ask the issuer to block and reissue the card.
  4. 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) ↗
  5. 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. The Day1 Company data leak and damage to instructors were confirmed, and the company said it was assessing the scale of the damage.
  2. The leak of passwords and phone numbers was reported.
  3. Damage to information on Samsung, LG and Kakao employees was reported.
  4. A further leak of card and account information and the possibility of a further leak of account numbers were reported.
  5. Criticism was raised over the response to prevent secondary damage from the personal data leak.
  6. Criticism was raised over the lack of communication after the incident and the closure of the communication channel.

Also affected by this incident

11 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.