2025 China — 4B records, 631GB, WeChat/Alipay
Data compromised
WeChat IDs, Alipay cards, financial data, addresses, vehicle, gambling, employment, pension, insurance
Technical writeup
Largest data breach in Chinese history. 631GB database, ~4B records, unprotected. WeChat: 805M user IDs, 577M metadata. Alipay: 300M card/token records. 630M financial records, 780M addresses. Centralized aggregation for surveillance/profiling.
Root cause
Unprotected server; no password