Other
Yellow Hat online service booking
Yellow Hat online service booking (run by Yellow Hat Ltd.) was hit in 1 recorded cybersecurity incident. The latest was disclosed on 2026-08-28.
About the service
- Website
- https://www.yellowhat.jp/yellowhat/reservation
- Run by
- Yellow Hat Ltd.
- Category
- Other
- For
- People
Incident history
Disclosed 2026-08-28Updated 2026-10-23Tokyo[Contained][Severity: Critical][Breached][Critical]
Yellow Hat: unauthorized access to the online service booking system[Web app exploit][Data leak][Service outage]Leaked 1.8MOrganizations 1
Other incidents of the operator (1)
Disclosed 2026-04-23Updated 2026-10-23Tokyo[Contained][Severity: Critical]
Yellow Hat: member data taken through the 2Rinkan app API[API abuse][Data leak][Service outage]Leaked 3.5MOrganizations 1