According to Security NEXT, the Aichi Prefectural Mental Health and Welfare Center lost 79 mental disability certificate applications and 154 medical care for services and supports for persons with disabilities certificate applications, affecting 172 individuals after deduplication [1]. The documents contained names, addresses, phone numbers, Individual Numbers (My Number), dates of birth, diagnoses, medical histories, clinical conditions, examination results, and family member information [1]. Staff noticed that some documents were missing while reviewing fiscal 2023 files in November 2025, failed to locate them after searching through August 2026, and discovered additional missing documents during an inventory check [1].
This event has not been officially confirmed. Content is based on media or third-party reports.
MediumMonitoringMedia reported
Aichi Prefectural Mental Health and Welfare Center Loses Application Documents Containing Health and Identity Data of 172 Individuals
1 min read
- Disclosed
- Oct 30, 2026
- Published
- Nov 11, 2026
- Last updated
- Nov 7, 2026
- CVSS basis
- Our assessment
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government
What to do nowOur advice
Staff noticed that some documents were missing while reviewing fiscal 2023 files in November 2025, failed to locate them after searching through August 2026, and discovered additional missing documents during an inventory check [1].
Timeline
- Security NEXT publishes report (date only; timestamp is a placeholder)[1]
Technical details
Verified Source Summary
The Aichi Prefectural Mental Health and Welfare Center lost 79 mental disability certificate applications and 154 medical care for services and supports for persons with disabilities certificate applications, affecting 172 individuals after deduplication [1].
The documents contained names, addresses, phone numbers, Individual Numbers (My Number), dates of birth, diagnoses, medical histories, clinical conditions, examination results, and family member information [1].
Staff noticed that some documents were missing while reviewing fiscal 2023 files in November 2025, failed to locate them after searching through August 2026, and discovered additional missing documents during an inventory check [1].
References
Media1
- [1]
“愛知県は、精神保健福祉センターにおいて、個人情報が記載された申請書類を紛失したことを明らかにした。”
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