education-software-dormant-2026 · Disclosed 2026-08-17
教育ソフトウェア: unauthorized access and impact
A dormant rental server used for a service ending in 2016 was accessed and encrypted. 4,627 old-service records may have been exposed; investigation did not confirm leakage.
Outcome: Confirmed breach
Entry path and evidence
Timeline
Disclosure date established by the reviewed notice. [s1]
Reported response
- Reported fact
The network was disconnected, specialists investigated, and the server retired.
[s1]本件の概要 / 現在の状況
Evidence relevant to prevention
Operational controls to inspect
Inspect the disclosed configuration, authorization or operational issue. Verify applicability and retain evidence of behavior after remediation.
Editorial assessment; not a determination of liability. [s1]
Unknowns and AI involvement
The reviewed disclosures do not establish attacker use of AI.
The estimated access window does not establish an exact intrusion-start day. Encrypted stored records are not confirmed exfiltration.
Sources
[s1] 教育ソフトウェア · Primary source
教育ソフトウェア：事故に関する公表資料 ↗Reviewed 2026-10-09