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JAENES
BPossible leakJune 29, 2026 announced

石川コンピュータ・センター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
Unconfirmed
Announced on
June 29, 2026
Severity
BIncidents centered on names and contact details.
Scale
2,551 records
Main impact
There is a risk of leakage for 1,929 emails with attachments and 2,551 attachment files, and the send/receive logs include 14,071 external email addresses.
Information involved
Email address
Cause / key point
Unauthorized access exploiting a vulnerability in the web system for downloading attachments.About Exploitation of vulnerabilities
Industry
IT & telecom
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
Email addressHow severity is assessed →

Is this incident worth paying attention to?

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: Exploitation of vulnerabilities(Breaking in through holes in software and devices)

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