Investigating

Sumoto City: hometown-tax data posted to SNS; up to about 23,000 records may have leaked

Possible data leak: On May 29, 2026 hometown-tax personal data was posted publicly on SNS; deletion requested the same day, confirmed May 30, disclosed June 5. Cause under investigation.

Last updated: 2026-11-09

Overview

23 posted rows confirmed (63 with duplicates). If the source list leaked, wording is “about 23,000”, so the count field is blank.

Timeline

  1. Occurred
  2. Discovered
  3. Disclosed

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

  1. 洲本市個人情報漏洩事案の発生について洲本市 · 2026-11-09

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