Sega security incident history
Hacking, data breaches and other security incidents involving Sega, with related coverage.
Sega announces follow-up measures after unauthorised access halts Lucky Kuji online sales
Impact: Suspension of sales of certain online lottery products
Sega Lucky Kuji Online and related services have been suspended since November 1, 2026, for safety checks following unauthorized access to Sega Fave's servers. This report concerns follow-up measures for certain lottery products whose sales were suspended, rather than a new incident.
Read on Yahoo!ニュース ↗About 2.2 million Sega newsletter email addresses leaked
2.2MImpact: 2,196,044 newsletter subscriber email addresses
Unauthorized access to the systems of Arara, Sega’s newsletter delivery provider, resulted in the leak of 2,196,044 subscriber email addresses. Sega investigated the incident and advised users to watch out for phishing emails. Sega accounts and users’ financial information were not affected.
Related reports: 21 · last report →