According to Security NEXT, on December 13, 2024, the Nagano Prefecture Sewage Works Corporation mailed documents to 65 successful candidates of a drainage equipment technician examination [1]. Up to 32 of those documents may have had other examinees' names, addresses, phone numbers, dates of birth, or workplace details printed on the reverse side due to accidental double-sided printing [1]. After receiving a report on December 17, the corporation apologized to all 65 recipients and requested the return of the documents [1].
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Backfill: this event became public on Dec 26, 2024 and we added it on Nov 10, 2026. It is not a new event.
MediumMonitoringBackfillMedia reported
Nagano Prefecture Sewage Works Corporation Misuses Double-Sided Printing, Exposing Other Examinees' Personal Data on Reverse Side
1 min read
- Disclosed
- Dec 26, 2024
- Published
- Nov 10, 2026
- Last updated
- Nov 7, 2026
- CVSS basis
- Our assessment
- Attack vector
- Impact
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government
What to do nowOur advice
After receiving a report on December 17, the corporation apologized to all 65 recipients and requested the return of the documents [1].
Timeline
- Security NEXT publishes report (date only; timestamp is a placeholder)[1]
Technical details
Verified Source Summary
On December 13, 2024, the Nagano Prefecture Sewage Works Corporation mailed documents to 65 successful candidates of a drainage equipment technician examination [1].
Up to 32 of those documents may have had other examinees' names, addresses, phone numbers, dates of birth, or workplace details printed on the reverse side due to accidental double-sided printing [1].
After receiving a report on December 17, the corporation apologized to all 65 recipients and requested the return of the documents [1].
References
Media1
- [1]
“長野県下水道公社は、下水道排水設備工事責任技術者資格認定共通試験の合格者に送付した書類の裏面に、関係ない別の合格者に関する個人情報が印字されていたことを明らかにした。”
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