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JAENES
BLeak confirmedSeptember 25, 2026 announced

井筒まい泉株式会社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
Unconfirmed
Announced on
September 25, 2026
Severity
BIncidents centered on names and contact details.
Scale
Unknown
Main impact
They announced that unauthorized access to the recruitment management platform resulted in applicant information being leaked externally via a contractor. The specific data items and number of people affected are not stated.
Information involved
Not specified in the disclosure
Cause / key point
Cause under investigation.About Supply chain attacks (via vendors & shared services)
Industry
Services & other
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
How 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: Supply chain attacks (via vendors & shared services)(Compromising the provider instead of the user)

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