シチズン時計（問い合わせ管理）Data breach / unauthorized access incident
- Occurred on
- October 2, 2026
- Announced on
- October 6, 2026
- Severity
- AFinancial and HR records — information that easily translates into monetary damage.
- Scale
- 100,000 people
- Main impact
- Personal data of about 100,000 people — names, addresses, email addresses, and inquiry details — and account or card information entered in message bodies may have been exposed. Whether a leak occurred is currently under investigation.
- Information involved
- Email addressCard & payment dataPhone numberHome addressFull name
- Cause / key point
- Unauthorized login to the contractor's FAQ system management site for "i-ask" and installation of malicious program(s).About Abuse of credentials
- Industry
- Manufacturing
- Listing / capital
- Listed company東証プライム 7762(シチズン時計)
- Sources
- Last updated
- October 20, 2026
Stock price reaction to the disclosureシチズン時計 / 東証プライム 7762
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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:
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)
Read the Abuse of credentials guide and national trends →