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JAENES
SPossible leakJanuary 28, 2026 announced

株式会社山元紙包装社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
Unconfirmed
Announced on
January 28, 2026
Severity
SCompromise of deep personal data or usable credentials.
Scale
3,973 people
Main impact
They announced that unauthorized access to パッケージショップJP may have exposed personal data of 3,973 individuals and card information of 1,395 individuals.
Information involved
Email addressPasswordCard & payment dataPhone numberFull name
Cause / key point
The company says that unauthorized access exploiting vulnerabilities in part of their systems led to the payment application being tampered with.About Exploitation of vulnerabilities
Industry
Manufacturing
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
Email addressPasswordCard & payment dataPhone numberFull nameHow 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: Exploitation of vulnerabilities(Breaking in through holes in software and devices)

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