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Data breach

Intrusion via shared authentication system leaks LINE Yahoo personal data

First reported · Last reported · 12 related reports

Unauthorised access to LINE Yahoo's internal systems led to a leak of personal information. The attack began with a malware infection on a PC belonging to an employee of a NAVER Cloud subcontractor and proceeded through a shared authentication system. The scale of the leak was initially reported at about 400,000 cases and later at 510,000, and the LINE Yahoo president apologised.

Key facts

Affected organisation
LY Corporation
Incident type
Data breach
Occurred / detected
Not confirmed
Scale of damage
About 510,000 cases of personal information
Cause / method
Malware infection of a NAVER Cloud subcontractor employee's PC and unauthorised access to internal systems via a shared authentication system
Location
Japan

If your data was exposed

  1. Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organisation’s official website or app.

Timeline

  1. The leak of about 400,000 cases of LINE Yahoo personal information and the intrusion route via a shared authentication system came to light.
  2. The LINE Yahoo president repeatedly apologised for the leak of 440,000 cases of personal information.
  3. The scale of the personal information leak was reported to be 510,000 cases.
  4. The Personal Information Protection Commission (PIPC) disclosed that Japan had enquired about cooperation in investigating NAVER.
  5. Japan judged the measures against the personal information leak to be sufficient and effectively withdrew its demand for the sale of LINE.

12 related reports

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