← LY Corporation (Line/Yahoo Japan)

2023 Line/Yahoo Japan — 520k, cyber infection

2023 520.0K records affected Share on X

Data compromised

User account data, messaging metadata

Technical writeup

LY Corporation (Line and Yahoo Japan) suffered a breach in 2023 affecting 520,006 users. The breach was caused by cyber infection/unauthorized access. Line is Japan's dominant messaging app; Yahoo Japan is a major portal.

Root cause

Cyber infection; unauthorized access

References