JUNMail magazine

2LowPossibleAnnounced

An attack on a contractor IDC Frontier cloud led JUN to stop its mail magazine. Some subscriber emails stored with the contractor may have leaked.

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
Retail & e-commerce
Operational impact
Some services stopped

Data involved

DataStatusCountGroupEvidence
Email addressPossible leakNot disclosed—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. 当社業務委託先が利用するクラウド基盤におけるシステム障害について(第1報)www.jun.co.jp · Published 2026-10-08(opens in a new tab)