SPossible leakMay 28, 2026 announced

ポラリス・ホールディングス株式会社Data breach / unauthorized access incident

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

Occurred on: Unconfirmed
Announced on: May 28, 2026
Severity: SCompromise of deep personal data or usable credentials.
Scale: Unknown
Main impact: A Booking.com account was fraudulently used and the payout destination was changed, resulting in 約900万円 being sent to a third party. Transfer loss occurred at 1 hotel, causing financial damage and a risk of further fraudulent transfers.
Information involved: User / member ID
Cause / key point: Cause is under investigation.
Industry: Services & other
Listing / capital: Listed company東証スタンダード 3010(ポラリス・ホールディングス)
Sources: 不正アクセス（Booking.com アカウント）に関するお知らせ 2026-05-28
Last updated: October 20, 2026

Stock price reaction to the disclosureポラリス・ホールディングス / 東証スタンダード 3010

2026.05.08 〜 2026.06.18Loading…

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.

How severity is assessed →

Is this incident worth paying attention to?

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