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JAENES
SPossible leakOctober 19, 2026 announced

スクウェア・エニックス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 19, 2026
Severity
SCompromise of deep personal data or usable credentials.
Scale
Unknown
Main impact
Unauthorized logins to スクウェア・エニックス accounts using email address/account ID/password combinations believed to have leaked from other services have been confirmed; there is a risk of compromise for users who use the same combinations across services or easily guessed passwords. Login restrictions are being applied to accounts suspected of being affected.
Information involved
Email addressUser / member IDPasswordDate of birth
Cause / key point
Unauthorized logins caused by reuse of authentication information believed to have leaked from other services (credential reuse / methods similar to credential stuffing).About Abuse of credentials
Industry
Services & other
Listing / capital
Listed company東証プライム 9684
Sources
Last updated
October 27, 2026

Stock price reaction to the disclosureスクウェア・エニックス / 東証プライム 9684

2026.09.29 〜 2026.10.27Loading…

Stock information is reference data based on Yahoo Finance and may be delayed. This site does not solicit or advise investment and does not guarantee the accuracy or completeness of this information. We accept no liability for any investment decision based on it.

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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: Abuse of credentials(Logging in legitimately with leaked or guessed passwords)

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