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JAENES
APossible leakOctober 17, 2026 announced

セカンドリテイリング（ゲオ・セカンドストリート）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
October 17, 2026
Severity
AFinancial and HR records — information that easily translates into monetary damage.
Scale
Unknown
Main impact
After unauthorized access to internal systems, セカンドリテイリング suspended apps and web services such as ゲオ・セカンドストリート from 10月17日21時. Whether any information was leaked and the number of records, if any, have not been disclosed.
Information involved
Not specified in the disclosure
Cause / key point
Cause under investigation.
Industry
Retail & e-commerce
Listing / capital
Unlisted
Sources
Last updated
October 20, 2026
How 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: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)

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