エバーグリーン・マーケティング（メール）Data breach / unauthorized access incident
- Occurred on
- June 26, 2026
- Announced on
- October 6, 2026
- Severity
- SCompromise of deep personal data or usable credentials.
- Scale
- 763 records
- Main impact
- Unauthorized login to an employee's email account occurred, and account and billing information—including addresses and personal names—of 237 business partners (e.g., agencies) and 763 corporate customers may have been viewed.
- Information involved
- Email addressCard & payment dataHome addressFull name
- Cause / key point
- Unauthorized login to an employee's email account.About Abuse of credentials
- Industry
- Services & other
- Listing / capital
- Unlisted
- Last updated
- October 20, 2026
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).
Incidents related to "メールアカウント"
Incidents where the damage spread through the same service or system.
- B株式会社八十二長野銀行2026.10.19 announced・Affected 672 records
- S山口大学（教職員メール）2026.10.06 announced・Affected 1 accounts
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- S講談社BECK（旧ビーシーのメール）2026.10.02 announced・Affected 1 records
- B大気社（マレーシアグループ会社）2026.09.18 announced・Affected 1 accounts
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Same attack method
- A日本経済新聞社(日経)2026.10.16 announced・Affected 1,830,000 records
- Sチャーム本店2026.09.01 announced・Affected 370,000 records
- ACAMPFIRE2026.06.02 announced・Affected 225,846 accounts
- Aウエーブ（Webアップロード）2026.04.01 announced・Affected 176,810 records
- Aシチズン時計（問い合わせ管理）2026.10.06 announced・Affected 100,000 people
- Bイノベーション（GitHub）2026.08.07 announced・Affected 62,689 people
Same industry
- SSリクルート（カーセンサーnet、C-MATCH）2026.10.21 announced・Affected 3,709,551 records
- S日本郵政（ゆうID・ゆうゆうポイント）2026.10.19 announced・Affected 249 accounts
- S第一興商（ビッグエコー等）2026.10.08 announced・Affected 8,631,000 records
- Sセレス（ポイントインカム）2026.10.07 announced・Affected 195 records
- Sチケットプラス（チケプラ）2026.10.01 announced・Affected 107 people
- SEPARKリラク&エステ（PeakManager）2026.09.24 announced・Affected 22,180,000 records
Attack method classification: Abuse of credentials(Logging in legitimately with leaked or guessed passwords)
Read the Abuse of credentials guide and national trends →