Personal Information Breach Caused by Unauthorized Access at Yellow Hat
YELLOW HAT LTD.
Yellow Hat WEB Work Reservation System
Unauthorized intrusion into the Yellow Hat WEB Work Reservation System
Company response
Blocking and suspending the Yellow Hat WEB Work Reservation System
Investigation by a third-party investigative organization. The organization's name and establishment date are Not disclosed.
Continued implementation of enhanced security measures and system modifications, as well as regular vulnerability assessments
Related procedures
Forensic investigation by a third-party investigative organization, final report to the Personal Information Protection Commission, and investigation by the relevant police department
Personal Information Protection Commission and jurisdictional police
The response to this incident and associated costs are not expected to have a material impact on our business performance.
We will continue to handle questions and inquiries through the dedicated help desk and fully cooperate with the Personal Information Protection Commission and the relevant police department in their investigations. Regular vulnerability assessments will also continue.
| Item | Details |
|---|---|
| Event name | Personal Information Breach Caused by Unauthorized Access at Yellow Hat |
| Date of occurrence | 19 August 2026 (date unauthorized access was detected) |
| Date recognized / date notice received | 19 August 2026 (date unauthorized access was detected) |
| Subject Entity | YELLOW HAT LTD. |
| Target Locations / Products | Yellow Hat WEB Work Reservation System |
| Cause | Unauthorized intrusion into the Yellow Hat WEB Work Reservation System |
| Impact on Earnings Forecast | The response to this incident and associated costs are not expected to have a material impact on our business performance. |
| Type of litigation or proceeding | Forensic investigation by a third-party investigative organization, final report to the Personal Information Protection Commission, and investigation by the relevant police department |
| Court or authority | Personal Information Protection Commission and jurisdictional police |
| Suspended operations | Blocking and suspending the Yellow Hat WEB Work Reservation System |
| Investigation structure | Investigation by a third-party investigative organization. The organization's name and establishment date are Not disclosed. |
| Measures to prevent recurrence | Continued implementation of enhanced security measures and system modifications, as well as regular vulnerability assessments |
| Outlook | We will continue to handle questions and inquiries through the dedicated help desk and fully cooperate with the Personal Information Protection Commission and the relevant police department in their investigations. Regular vulnerability assessments will also continue. |
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.Customer data was leaked externally due to unauthorized intrusion into the Yellow Hat WEB Work Reservation System.