The Mainichi Newspapers Co., Ltd.

Companies / web services

Aliases / services: The Mainichi Newspapers Co., Ltd. / 株式会社毎日新聞社 / 每日新闻社
Official website: https://www.mainichi.co.jp/

Sources identifying the operating company

https://www.mainichi.co.jp/company/about.html

Each response applies only to its stated service scope. “Not listed” does not mean unpatched or unaffected.

Response status by service

Mainichi Digital long-term plan and corporate emails

Response status: Not listed
Response information checked: 2026-10-30

Current re-audit: Related incident verified; PHP connection not stated · Research date: 2026-10-30

The October 28, 2026 update confirms email/name data leakage affecting 2,061 long-term-plan records and 267 corporate-notice records, excluding cards and passwords. After additional safeguards, mail distribution resumed October 28 and affected users were individually notified.

Scope: A PHP connection and response to the current PHP vulnerabilities are not listed.

What users should do

Delete suspicious messages without opening links or attachments; verify through official channels.

Official service URL

https://www.mainichi.co.jp/

Source URLs

2026-10-28 Official Mainichi Digital long-term plan and corporate emails noticehttps://www.mainichi.co.jp/info/news/20261028-2.htmlService and operation documentation

Related official sources

2026-10-28 Official Mainichi Digital long-term plan and corporate emails noticeOfficial notice; link to this PHP incident unconfirmedConfirms scope, chronology and user guidance.