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ABOUT

About this site

Leak Watch is a media outlet that organizes the latest information on data breaches and unauthorized access in Japan, aiming to raise security awareness and spread practical prevention. No login or registration — everything is free to read.

So that you can understand where your data may be leaking and how to prepare, we bring together news summaries, an incident database, global security coverage, and protection guides in one place.

Operation

Operator

MediaLeap Inc.

Company overview: address, representative, contacts →

笹尾 祐太朗の写真Editor-in-chiefYutaro SasaoCareer, expertise, and review policy →

Contents

  • News: official announcements and trusted reporting summarized in Japanese. Sources are always cited, including global trends and social discussion.
  • Breach database: disclosed data breach and unauthorized access incidents recorded with severity, confirmation status, and information types (criteria).
  • Protection: security measures you can start now, organized by level — for everyone from individuals to developers.

How sources are chosen, the scope of AI use, the review system, and corrections are described in the editorial policy.

Disclaimers

  • This site organizes publicly disclosed information; completeness and accuracy are not guaranteed.
  • Always verify incidents and responses with each company's official announcements and channels.
  • Severity is an indication of an incident's gravity, not an assessment of a company's overall security.
  • The operator is not liable for damages arising from the content.

Staying updated

New articles and incidents are available via the RSS feed.