Renaissance: a bulk mail to instructors showed recipients' addresses, exposing 2,650 email addresses
The fitness club operator emailed its contract instructors without using BCC, so 2,650 addresses were visible to other recipients.
Disclosed
2020-04-22
Organizations involved
1
Leaked or at risk
2.7K
2,650
Downtime
Unknown
What happened
When the company sent a notice to instructors and other contractors working at its sports clubs, it did not put the addresses in BCC. Each mail went to 50 people. [1]
Impact
2,650 email addresses were visible to other recipients. [1]
Timeline
- Disclosed 2020-04-22
- 1 days
Attack or cause
- Method
- [Misdelivery]
- Impact
- [Data leak]
- Entry point
Data exposed or at risk
Organizations involved
[Breached][Moderate]Tokyo, SumidaPersonal services and entertainment2,650 leaked
Renaissance, Inc.
Sources
- [1][News]インストラクターへのメール誤送信、1通50件ずつ計2,650名のアドレス流出（ルネサンス）ScanNetSecurity · 2020-04-27 08:00