SPossible leakSeptember 28, 2026 announced

手間いらず（宿泊予約管理システム）Data breach / unauthorized access incident

Reviewed by Yutaro SasaoWritten by Leak Watch editorial teamSeptember 28, 2026 published ・ October 20, 2026 updated

Occurred on: Unconfirmed
Announced on: September 28, 2026
Severity: SCompromise of deep personal data or usable credentials.
Scale: 4,450,000 people
Main impact: Up to approximately 445万人 of accommodation reservation information in the reservation management system may have been viewed or obtained. Card information is said not to be held. Whether data was exfiltrated is not confirmed within the scope of publicly available materials.
Information involved: Email addressPhone numberFull name
Cause / key point: The cause is under investigation.
Industry: IT & telecom
Listing / capital: Listed company東証スタンダード 2477(手間いらず)
Sources: 不審なメッセージおよび当社システムへの不正アクセスに関するお詫びとお知らせ 2026-09-28
当館が利用する予約管理システムにおける不正アクセスに関するお詫びと注意喚起 2026-10-10
Last updated: October 20, 2026

Stock price reaction to the disclosure手間いらず / 東証スタンダード 2477

2026.09.08 〜 2026.10.19Loading…

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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