> JapanHacked_
[Investigating][Severity: Major][Intrusion]

Weathercaster Network: its website was broken into and defaced; data of members and course applicants in up to 15,959 records may have leaked

The website of a weathercaster group was broken into and defaced; up to 15,959 records from sign-ups, course applications and inquiries since December 2018 may have leaked.

Disclosed

2026-10-06

Organizations involved

1

Leaked or at risk

16K

15,959

Downtime

Unknown

What happened

  1. Unauthorized access to the website began. [1]

  2. The hosting company reported odd files on the server, which were deleted. [1]

  3. The site was defaced and began redirecting visitors to an unrelated outside site. [1]

  4. The site was closed and the server files deleted. [1]

  5. Disclosed. [1]

Impact

Up to 15,959 records from membership sign-ups and changes, applications for courses and other events, and the contact form since December 2018: names and email addresses, some with addresses and phone numbers. [1]

Response

It reported to the Personal Information Protection Commission and is preparing an outside investigation. The site will return once it is confirmed safe. [1]

Timeline

  1. Started 2026-09-24
  2. Detected 2026-09-27
  3. Disclosed 2026-10-06
  4. 12 days

Organizations involved

Open in organization search

Sources

  1. [1][Official]弊会ウェブサイト不正アクセスによる個人情報漏えいの可能性に関するお詫びとお知らせWeathercaster Network · 2026-10-06