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

Hirota: a mail magazine was sent with recipients set in the To field by mistake, letting 2,350 subscribers see each other's email addresses

A mail magazine was sent with the recipients in the To field, so the email addresses of 2,350 subscribers were visible to one another.

Disclosed

2021-03-25

Organizations involved

1

Leaked or at risk

2.4K

2,350

Downtime

Unknown

What happened

  1. When sending a notice for "Cream Puff Day" as a mail magazine, the company set the recipients in the To field by mistake. It was sent shortly after 11:30. [1]

Impact

The email addresses of 2,350 subscribers became visible to the other recipients. No leak of other data was reported. [1]

The company apologized to the subscribers concerned by email and asked them to delete the mail. [1]

Timeline

  1. Started 2021-03-19
  2. Disclosed 2021-03-25
  3. 6 days

Attack or cause

Method
[Misdelivery]
Impact
[Data leak]
Entry point
E-mail

Data exposed or at risk

[E-mail address]

Organizations involved

Open in organization search

Sources

  1. [1][News]メルマガで送信ミス、メアド2350人分が流出 - 洋菓子のヒロタSecurity NEXT · 2021-03-25