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JAENES
CPossible leakAugust 7, 2026 announced

国立研究開発法人科学技術振興機構（JST）Data breach / unauthorized access incident

笹尾 祐太朗の写真Reviewed by Yutaro SasaoWritten by Leak Watch editorial team published ・ updated
Occurred on
July 28, 2026
Announced on
August 7, 2026
Severity
CLimited data such as email addresses and identifiers.
Scale
18,000 records
Main impact
Due to unauthorized third‑party access, approximately 18,000 emails stored in the mailboxes of 12 JST役職員 may have been leaked externally, possibly including about 1,400 external email addresses and about 1,000 JST役職員 email addresses.
Information involved
Email address
Cause / key point
Unauthorized third‑party access resulted in unlawful access to the mailboxes of some officers and staff.
Industry
Education
Listing / capital
Government / public body

National Research and Development Agency 国立研究開発法人JST

Sources
Last updated
October 20, 2026
Email addressHow severity is assessed →

Is this incident worth paying attention to?

Written & reviewed

笹尾 祐太朗の写真

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: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)

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