Tokyo Hanyaku: website defaced
From early December 6 through 23:00 on December 7, the website's homepage was altered and some visitors redirected to unintended pages. Investigation and remediation restored normal service by the December 12 notice. Customer and business data were held in separate networks, with no leakage or misuse reported.
Disclosed
2025-12-12
Organizations involved
1
Leaked or at risk
Unknown
Downtime
Unknown
Timeline
- Started 2025-12-06
- Disclosed 2025-12-12
- 6 days
Attack or cause
- Method
- [Intrusion]
- Impact
- [Site defacement][Service outage]
- Entry point
- Web app
Data exposed or at risk
–
Organizations involved
[Breached][Moderate]Tokyo, ToshimaScientific research, professional and technical services
Tokyo Hanyaku Co., Ltd.
Sources
- [1][Official]Webサイトの一時的なアクセス障害についてのお詫びとご報告Tokyo Hanyaku Co., Ltd. · 2025-12-12