> JapanHacked_
[Resolved][Severity: Major][Misdelivery]

Kasama City: when mailing care insurance premium notices, a contractor's enclosing error put another person's payment slip in 1,451 envelopes

Of 2,490 notices, 1,451 contained another person's payment slip. The city collected all 2,490 by visiting homes and mailed new notices.

Disclosed

2021-08-11

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

What happened

  1. When mailing 2,490 FY2021 care insurance premium notices, it found that another person's payment slip had been enclosed. The cause was an enclosing error by its computing contractor TKC, and the barcodes printed on the notices and slips were also wrong. [1] [2]

  2. It announced the case and asked recipients not to open the notices. [1] [2]

  3. New premium notices were mailed. [1]

  4. The plan was to collect all 2,490 by visiting each home by this day. [1]

Timeline

  1. Started, Detected 2021-08-10
  2. Disclosed 2021-08-11
  3. 1 days

Attack or cause

Method
[Misdelivery]
Impact
[Data leak]
Entry point
Supplier

Data exposed or at risk

[Name]

Organizations involved

Open in organization search

Sources

  1. [1][Official]令和３年度介護保険料納入通知書の誤送付についてKasama City · 2021-08-11
  2. [2][News]送付書類のバーコード印字誤り さらに封入ミス重なる、全2,490件分 訪問回収ScanNetSecurity · 2021-08-17 08:00