ホテリエ（Grand Inn Canalsideなど8施設）Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- October 7, 2026
- Severity
- AFinancial and HR records — information that easily translates into monetary damage.
- Scale
- 7,919 people
- Main impact
- Unauthorized access via an account of the former operator was confirmed, resulting in the exposure of names, contact details, and reservation information for 7,919 individuals across 8 facilities. Addresses, card information, and passport information were not affected.
- Information involved
- Email addressPhone numberFull name
- Cause / key point
- ホテリエ states that when it took over operations from the former operator in 2022, the account information was not in the handover materials and they were unaware of its existence; on 2026年9月14日 they confirmed unauthorized access via this account, but the reason a third party could use it is unknown.
- Industry
- Real estate
- Listing / capital
- Unlisted
- Last updated
- October 20, 2026
Is this incident worth paying attention to?
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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)
Read the Unauthorized access (method undisclosed) guide and national trends →