LY Corporation

Japanese internet company formed in 2023 from merger of Z Holdings, LINE Corporation, and Yahoo! Japan. Operates LINE messaging app (96M users in Japan) and Yahoo! Japan. Joint venture between SoftBank and Korea's Naver Corporation. Facing government pressure to separate from Naver after 2023 data breach.

Track Record

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Suffered major data breach affecting 520,000 users due to shared infrastructure with Korean parent

Oct 9, 2023

negligent

In October 2023, LY Corporation suffered a data breach when hackers accessed systems through affiliate NAVER Cloud. The breach leaked 440,000+ items of personal data including users' age group, gender, and service histories. The incident stemmed from shared Active Directory authentication with former parent company Naver. Japan's Ministry of Internal Affairs issued administrative guidance twice in 2024, calling for system separation from Naver.

- Data Security - User Privacy

Sources: LY Corporation· The Register