Kyushu Electric lost backup drive containing data of 10.9 million clients

📅 11 June 2026 at 11:31 UTC📰 Cyber InsiderView original source ↗

Kyushu Electric Power Transmission and Distribution Co. has disclosed that an external storage device used for system backups has gone missing from a secure server room. While no evidence of data leakage has been identified so far, the company warns that the device contained personal and usage-related data for 10.9 million customers. The incident was … The post Kyushu Electric lost backup drive containing data of 10.9 million clients appeared first on CyberInsider.

🤖 AI BriefingAuto-generated threat analysis

🔍Threat Overview

Kyushu Electric Power Transmission and Distribution Co. reported a missing external storage device containing personal data for 10.9 million customers, with no evidence of data leakage identified yet.

⚙️Technical Details

Affected Systems

Secure server room housing servers

Attack Vectors

Unauthorized access to unsecured cabinet within secure facility

💥Impact Assessment

Severity: High

Who Is at Risk

10.9 million customers

🛡️Recommended Actions

1Implement additional security controls on external storage devices

2Conduct regular audits of access permissions to secure facilities

3Develop incident response plan for similar incidents in the future

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