Display of Personal Information Due to a System Error
LINKBAL INC.
My Page on the event e-commerce site "machicon JAPAN"
Deficiencies on the part of the company in the system update implemented on 4 August 2026. The incident was not caused by an external attack or unauthorized access.
Related procedures
Preliminary report to the Personal Information Protection Commission
Personal Information Protection Commission
Company response
None. There has been no impact on the operation of the company's services or the holding of subsequent events.
Introduce a mechanism to automatically detect, through inspections, code that could cause information to be shared among users on the server side, Add automated tests to verify that information is not mixed between users, Introduce a mechanism to automatically detect similar deficiencies when an update is proposed
The impact of this incident on the company's results is currently expected to be minor.
The program that caused the issue has been corrected, and the login sessions of all customers have been cleared. The service can currently be used normally. The company will proceed with individual notifications to affected customers. No evidence of information leakage outside the service or unauthorized use outside the service has been identified.
If the investigation reveals any new facts that should be disclosed, the company will make the information available promptly.
| Item | Details |
|---|---|
| Event name | Display of Personal Information Due to a System Error |
| Date of occurrence | Around 15:25 on 4 August 2026 (the starting point of the period during which the incident could have occurred) |
| Subject Entity | LINKBAL INC. |
| Target Locations / Products | My Page on the event e-commerce site "machicon JAPAN" |
| Cause | Deficiencies on the part of the company in the system update implemented on 4 August 2026. The incident was not caused by an external attack or unauthorized access. |
| Impact on Earnings Forecast | The impact of this incident on the company's results is currently expected to be minor. |
| Type of litigation or proceeding | Preliminary report to the Personal Information Protection Commission |
| Court or authority | Personal Information Protection Commission |
| Suspended operations | None. There has been no impact on the operation of the company's services or the holding of subsequent events. |
| Measures to prevent recurrence | Introduce a mechanism to automatically detect, through inspections, code that could cause information to be shared among users on the server side, Add automated tests to verify that information is not mixed between users, Introduce a mechanism to automatically detect similar deficiencies when an update is proposed |
| Outlook | The program that caused the issue has been corrected, and the login sessions of all customers have been cleared. The service can currently be used normally. The company will proceed with individual notifications to affected customers. No evidence of information leakage outside the service or unauthorized use outside the service has been identified. |
| Planned follow-up disclosure | If the investigation reveals any new facts that should be disclosed, the company will make the information available promptly. |
Items this document does not state (13)
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.Deficiencies in the system update implemented on 4 August 2026 caused users' information to be mixed up when requests from multiple users were processed simultaneously. The company explained that the incident was not caused by an external attack or unauthorized access.