Completion of Investigation into Unauthorized Access at a Consolidated Subsidiary
株式会社メディア4u (a consolidated subsidiary of the filing company)
SMS delivery system "Aurora SMS CONSOLE"
Unauthorized access by a third party
No amount has been disclosed. The impact on consolidated results for the fiscal year ending March 2027 is currently expected to be immaterial.
Fiscal year ending March 2027
The impact of this matter on our consolidated results for the fiscal year ending March 2027 is currently expected to be immaterial, although it remains under review.
Company response
An investigation by a third-party specialist organization, including log forensics, was conducted and completed on 2 November 2026.
Security enhancements, including the addition of an automatic IP address blocking function for failed login attempts and stricter password policies; establishment of a specialized security response organization on 1 August 2026; implementation of permanent measures, including expanding the scope of security assessments and reviewing assessment methods; continued monitoring
We will implement permanent measures, including expanding the scope of security assessments and reviewing assessment methods, and continue monitoring. The service is operating as usual.
If any matters requiring disclosure arise, they will be reported promptly.
| Item | Details |
|---|---|
| Event name | Completion of Investigation into Unauthorized Access at a Consolidated Subsidiary |
| Date of occurrence | 2 November 2026 (investigation completion date) |
| Subject Entity | 株式会社メディア4u (a consolidated subsidiary of the filing company) |
| Target Locations / Products | SMS delivery system "Aurora SMS CONSOLE" |
| Cause | Unauthorized access by a third party |
| Amount of Impact on Business Performance | No amount has been disclosed. The impact on consolidated results for the fiscal year ending March 2027 is currently expected to be immaterial. |
| Accounting period in which recognized | Fiscal year ending March 2027 |
| Impact on Earnings Forecast | The impact of this matter on our consolidated results for the fiscal year ending March 2027 is currently expected to be immaterial, although it remains under review. |
| Investigation structure | An investigation by a third-party specialist organization, including log forensics, was conducted and completed on 2 November 2026. |
| Measures to prevent recurrence | Security enhancements, including the addition of an automatic IP address blocking function for failed login attempts and stricter password policies; establishment of a specialized security response organization on 1 August 2026; implementation of permanent measures, including expanding the scope of security assessments and reviewing assessment methods; continued monitoring |
| Outlook | We will implement permanent measures, including expanding the scope of security assessments and reviewing assessment methods, and continue monitoring. The service is operating as usual. |
| Planned follow-up disclosure | If any matters requiring disclosure arise, they will be reported 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.Log forensics by a third-party specialist organization identified the files taken outside the system. The stated reasons are that the scope of the personal data leak did not expand beyond the maximum figure reported in the initial report and that no new unauthorized access or secondary damage was identified.