VIEW CardVIEW's NET

2LowPossibleAnnounced

An external email delivery service was breached. Up to about 4.03 million email addresses may have been viewed or taken. Names, addresses, phone numbers and card numbers are not affected.

This incident was imported from a dataset that compiles public announcements, and we are still checking it against the sources. Counts and causes will be updated after the check. Sources are in Japanese.

Cause
Via a vendor or service
Sector
Finance & insurance
Operational impact
None

Data involved

DataStatusCountGroupEvidence
Email addressPossible leakup to 4,030,000 records—Source(opens in a new tab)

Counts are the figures the organization announced. Because the same person may be counted more than once, we do not add the rows together.

What users should do

  • Watch for emails and texts pretending to be the company

General steps based on the type of data involved. Check the organization’s notice or help line to see whether you are affected.

Sources

  1. IDCフロンティア社で発生した不正アクセスに伴うメール配信用外部サービスからのメールアドレス漏えい可能性についてwww.jreast.co.jp · Published 2026-10-09(opens in a new tab)