大阪府（おおさか事業者ポータル）Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- July 28, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 15 records
- Main impact
- On the おおさか事業者ポータル, account information for medical institutions different from the applicant became viewable; published impact includes 15 account holder names, 16 viewing institutions, 14 viewed institutions, and 1 inactive institution.
- Information involved
- Card & payment dataFull name
- Cause / key point
- When migrating past application data, records were linked using only the account opener name, allowing information for different openers to be viewed.
- Industry
- Government & municipal
- Listing / capital
- Government / public body
Public portal of 大阪府
- 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
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Attack method classification: Misconfiguration & access-control gaps(Data left readable by anyone)
Read the Misconfiguration & access-control gaps guide and national trends →