大阪市総合生涯学習センター（メール）Data breach / unauthorized access incident
- Occurred on
- September 7, 2026
- Announced on
- September 8, 2026
- Severity
- CLimited data such as email addresses and identifiers.
- Scale
- 168 people
- Main impact
- A contact email for the lifelong learning program was mis-sent with the email addresses of 168 recipients visible to other recipients, and although a deletion request was made, completion confirmation has not been published.
- Information involved
- Email address
- Cause / key point
- Incorrect entry of recipient addresses into the To field and insufficient multi-person verification.
- Industry
- Government & municipal
- Listing / capital
- Government / public body
A public facility of Osaka City
- 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 "アドレス"
Incidents where the damage spread through the same service or system.
Same attack method
- B京都サンガF.C.2026.09.08 announced・Affected 15,612 people
- B沖縄県立芸術大学2026.10.02 announced・Affected 207 people
- Dデジタル庁（国家資格システム）2026.08.07 announced・Affected 150 people
- CCLASS EARTH株式会社2026.10.07 announced・Affected 69 records
- C神奈川県消防保安課（事業者へのメール誤送信）2026.10.14 announced・Affected 55 records
- B大阪市立美術館2026.09.24 announced・Affected 30 people
Same industry
- S市立岸和田市民病院（患者書類）2026.10.16 announced・Affected 1 people
- S大崎地域広域行政事務組合消防本部（NET119・119RAIDEN）2026.10.14 announced・Affected 45 people
- S神奈川県警（使用済み運転免許証）2026.10.09 announced・Affected 30 records
- S長崎市（マイナンバーカード特急発行書類の紛失）2026.09.08 announced・Affected 4 people
- S村田製作所2026.04.27 announced・Affected 73,000 records
- S静岡市2026.01.30 announced・Affected 3,950 people
Attack method classification: Misdirected sending & disclosure (human error)(Leaks caused by wrong recipients or exposure settings)
Read the Misdirected sending & disclosure (human error) guide and national trends →