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JAENES
CLeak confirmedOctober 7, 2026 announced

CLASS EARTH株式会社Data breach / unauthorized access incident

笹尾 祐太朗の写真Reviewed by Yutaro SasaoWritten by Leak Watch editorial team published ・ updated
Occurred on
October 7, 2026
Announced on
October 7, 2026
Severity
CLimited data such as email addresses and identifiers.
Scale
69 records
Main impact
An email misdelivery to co-creation volunteer applicants exposed 69 email addresses to other recipients. No postal addresses or phone numbers were included.
Information involved
Email address
Cause / key point
The company says it sent the messages using regular email rather than a distribution-only tool and did not sufficiently check the recipients before sending.
Industry
Services & other
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
Email addressHow severity is assessed →

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Written & reviewed

笹尾 祐太朗の写真

Reviewed byYutaro SasaoFounder & CEO, MediaLeap Inc.

CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.

Review scope: cross-checking against primary sources (official and government announcements), verifying claims stay within the facts, and checking source attribution。Last reviewed:

Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction

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Attack method classification: Misdirected sending & disclosure (human error)(Leaks caused by wrong recipients or exposure settings)

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