ロート製薬（顧客対応情報）Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- September 15, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- Unknown
- Main impact
- Possible unauthorized access to the mail-order customer support system has been reported; the scope and the contents of any data leakage are currently under investigation.
- Information involved
- Not specified in the disclosure
- Cause / key point
- The cause is under investigation.
- Industry
- Manufacturing
- Listing / capital
- Listed company東証プライム 4527(ロート製薬)
- Last updated
- October 20, 2026
Stock price reaction to the disclosureロート製薬 / 東証プライム 4527
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.
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:
Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction
Related incidents
Browse the database →Incidents sharing the same company, service, attack method or industry (grouped automatically from the disclosures).
Same attack method
- SSソースネクスト2026.10.15 announced・Affected 22,519,960 records
- SSバーガーキング・ジャパン(公式アプリ)2026.10.15 announced・Affected 11,180,000 records
- SS焼肉きんぐ2026.10.05 announced・Affected 10,788,963 records
- Bユミルリンク（メール配信システム）2026.10.19 announced・Affected 9,000,000 records
- SSタイムズカー(タイムズモビリティ)2026.09.25 announced・Affected 6,600,000 accounts
- Sブックオフグループ(ブックオフコーポレーション)2026.10.09 announced・Affected 6,383,279 people
Same industry
- SS精電舎電子工業2026.07.21 announced・Affected Unknown
- SS富士フイルムメディカル株式会社2025.12.23 announced・Affected 590,000 people
- S大川精螺工業株式会社2026.07.24 announced・Affected Unknown
- S新エフエイコム(岡谷鋼機グループ)2026.07.21 announced・Affected Unknown
- S三浦工業2026.05.18 announced・Affected 5,021 records
- S東山産業株式会社2026.05.12 announced・Affected Unknown
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 →