調查中

Yamagata City: staff and resident data may have leaked via contractor YCC ransomware

Possible data leak: After the April 2, 2026 YCC attack, a review through April 15 found city data including ended contracts still on the vendor server; disclosed April 16.

最後更新: 2026-11-09

此內容以 English 顯示。

概述

Per-system counts (HR/payroll 6,167; health 31,766; child consultation 2,185) are not summed (count blank). Includes My Number and health-check fields.

時間軸

不明發生
2026-04-02發現
2026-04-16公布

組織應對措施

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

使用者應對建議

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.

資訊來源

株式会社YCC情報システムに対するサイバー攻撃に係る山形市保有個人情報の漏えいのおそれがある事案について山形市 · 2026-11-09