デントリネット（電力・ガス取引監視等委員会）Data breach / unauthorized access incident
- Occurred on
- October 27, 2026
- Announced on
- October 28, 2026
- Severity
- AFinancial and HR records — information that easily translates into monetary damage.
- Scale
- 1,100 records
- Main impact
- A reporting site used by a total of 1100 retail businesses has been taken offline, and there is a risk that businesses' financial information and other data may have leaked. As a result, impacts such as switching business report submissions to email have occurred.
- Information involved
- Not specified in the disclosure
- Cause / key point
- The system was breached via unauthorized access, but the method and entry route have not been disclosed and the cause is unknown.
- Industry
- Government & municipal
- Listing / capital
- Government / public body
- Last updated
- October 29, 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:
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)
Read the Unauthorized access (method undisclosed) guide and national trends →