Potential Leakage of Personal Information at YELLOW HAT LTD. Due to Unauthorized Access
YELLOW HAT LTD. (the filing company)
YELLOW HAT WEB Service Reservation System and member server. The data items involved are names, telephone numbers, email addresses, and membership numbers.
An attack by a malicious program targeting the YELLOW HAT WEB Service Reservation System
Related procedures
Report to the Personal Information Protection Commission and consultation with the police
Personal Information Protection Commission and police
Company response
Blocking external connections to and suspending the YELLOW HAT WEB Service Reservation System
Strengthened security; necessary measures have already been completed
If it becomes clear that this matter will have a material impact on future operating results, the company will disclose the matter promptly.
Customers who may be affected will be notified by email, SMS, telephone, and in writing with an apology and information urging caution as soon as preparations are complete. If it becomes clear that this matter will have a material impact on future operating results, the company will disclose the matter promptly.
| Item | Details |
|---|---|
| Event name | Potential Leakage of Personal Information at YELLOW HAT LTD. Due to Unauthorized Access |
| Date of occurrence | Morning of 18 August 2026 (Tuesday) (the date unauthorized access was detected) |
| Date recognized / date notice received | Morning of 18 August 2026 (Tuesday) (unauthorized access detected) |
| Subject Entity | YELLOW HAT LTD. (the filing company) |
| Target Locations / Products | YELLOW HAT WEB Service Reservation System and member server. The data items involved are names, telephone numbers, email addresses, and membership numbers. |
| Cause | An attack by a malicious program targeting the YELLOW HAT WEB Service Reservation System |
| Impact on Earnings Forecast | If it becomes clear that this matter will have a material impact on future operating results, the company will disclose the matter promptly. |
| Type of litigation or proceeding | Report to the Personal Information Protection Commission and consultation with the police |
| Court or authority | Personal Information Protection Commission and police |
| Suspended operations | Blocking external connections to and suspending the YELLOW HAT WEB Service Reservation System |
| Measures to prevent recurrence | Strengthened security; necessary measures have already been completed |
| Outlook | Customers who may be affected will be notified by email, SMS, telephone, and in writing with an apology and information urging caution as soon as preparations are complete. If it becomes clear that this matter will have a material impact on future operating results, the company will disclose the matter promptly. |
| Planned follow-up disclosure | If it becomes clear that this matter will have a material impact on future operating results, the company will disclose the matter promptly. |
Items this document does not state (12)
These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.
The reasons the company gives
The company's own explanation, not something inferred from the numbers.An attack by a malicious program targeting the "YELLOW HAT WEB Service Reservation System."