Potential leakage of personal information due to unauthorized access to a cloud service used by the Company
CORONA CORPORATION (filing company)
External cloud service used to manage the Company’s construction information
Unauthorized access by a third party
Related procedures
Report to the Personal Information Protection Commission
Personal Information Protection Commission
The impact of this matter on the Company’s earnings forecast is currently under review. If any matters requiring disclosure arise, the Company will promptly disclose them.
Company response
The Company is continuing its investigation into the cause, identification of the scope of the impact, and access route in cooperation with external experts.
The Company will continue investigating the cause, scope of the impact and other matters. If any new facts come to light, the Company will provide a further report. A personal information inquiry desk is scheduled to open on 31 August 2026.
The Company will provide a further report if new facts come to light regarding the cause of the unauthorized access, the scope of the impact or other matters.
| Item | Details |
|---|---|
| Event name | Potential leakage of personal information due to unauthorized access to a cloud service used by the Company |
| Date of occurrence | 24 August 2026 (the date on which the incident was confirmed; the actual date of the unauthorized access is Not disclosed) |
| Date recognized / date notice received | 24 August 2026 (confirmed following an investigation prompted by information provided by a third party) |
| Subject Entity | CORONA CORPORATION (filing company) |
| Target Locations / Products | External cloud service used to manage the Company’s construction information |
| Cause | Unauthorized access by a third party |
| Impact on Earnings Forecast | The impact of this matter on the Company’s earnings forecast is currently under review. If any matters requiring disclosure arise, the Company will promptly disclose them. |
| Type of litigation or proceeding | Report to the Personal Information Protection Commission |
| Court or authority | Personal Information Protection Commission |
| Investigation structure | The Company is continuing its investigation into the cause, identification of the scope of the impact, and access route in cooperation with external experts. |
| Outlook | The Company will continue investigating the cause, scope of the impact and other matters. If any new facts come to light, the Company will provide a further report. A personal information inquiry desk is scheduled to open on 31 August 2026. |
| Planned follow-up disclosure | The Company will provide a further report if new facts come to light regarding the cause of the unauthorized access, the scope of the impact or other matters. |
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.An external cloud service used to manage the Company’s construction information was subject to unauthorized access by a third party. The cause and access route are currently under investigation.