Investigating

Yokote City: landowner personal data may have leaked after ransomware attack on survey contractor

Yokote City announced on November 5 that ransomware against contractor Shibata Survey (Yuzawa) may have leaked addresses and names of landowners handled in city-commissioned survey work.

Last updated: 2026-11-09

Overview

12 survey/cadastral contracts from FY2021-2026. "About 1,300 people" in aggregate (count blank). No misuse confirmed.

Timeline

UnknownOccurred
UnknownDiscovered
2026-11-05Disclosed

Organization response

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

What you can do

Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.

Sources

市発注業務委託者へのサイバー攻撃に伴う個人情報の漏えいの恐れについてお知らせします横手市 · 2026-11-09

Yokote City: landowner personal data may have leaked after ransomware attack on survey contractor

Overview

Timeline

Organization response

What you can do

Sources

Related information

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