ALeak confirmedOctober 21, 2026 announced

大阪大学Data breach / unauthorized access incident

Reviewed by Yutaro SasaoWritten by Leak Watch editorial teamOctober 21, 2026 published ・ October 22, 2026 updated

Occurred on: September 26, 2026
Announced on: October 21, 2026
Severity: AFinancial and HR records — information that easily translates into monetary damage.
Scale: 77,851 people
Main impact: Files that NEC had shared on cloud storage were downloaded by a third party, and it was confirmed that personal data of 77,851 people (alumni, current students, and faculty/staff) — including names, university IDs, and university-issued email addresses — were included.
Information involved: Full nameUser / member IDEmail address
Cause / key point: The leak resulted from NEC, which is contracted to operate the university-wide educational computing system, sharing files on cloud storage without contractual authorization, and those files being downloaded by a third party.About Supply chain attacks (via vendors & shared services)
Industry: Education
Listing / capital: Government / public body
Sources: 大阪大学公式資料 2026-10-21
Last updated: October 22, 2026

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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 22, 2026

Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction