APossible leakOctober 2, 2026 announced

サミーネットワークス（777CON-PASS）Data breach / unauthorized access incident

Reviewed by Yutaro SasaoWritten by Leak Watch editorial teamOctober 2, 2026 published ・ October 20, 2026 updated

Occurred on: September 25, 2026
Announced on: October 2, 2026
Severity: AFinancial and HR records — information that easily translates into monetary damage.
Scale: Unknown
Main impact: Telephone numbers, dates of birth, and photos, along with activity areas derived from location data, may be at risk of being leaked.
Information involved: Phone numberDate of birth
Cause / key point: Cause under investigation.
Industry: IT & telecom
Listing / capital: UnlistedParent company: セガサミーホールディングス(東証プライム 6460)
サミーネットワークス is a subsidiary of セガサミーHD.
Sources: 777CON-PASSへの不正アクセスによる個人情報流出の可能性に関するお詫びとお知らせ ※続報
Last updated: October 20, 2026

Stock price reaction to the disclosureセガサミーホールディングス・親会社 / 東証プライム 6460

2026.09.12 〜 2026.10.22Loading…

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Written & reviewed

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: October 20, 2026

Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction