Skip to content
JAENES
APossible leakOctober 13, 2026 announced

岡山市（災害時一斉情報配信サービス）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
Unconfirmed
Announced on
October 13, 2026
Severity
AFinancial and HR records — information that easily translates into monetary damage.
Scale
Unknown
Main impact
Due to unauthorized access to the operator of the disaster-time mass information distribution service, 岡山市 announced that personal information may have been leaked. Some functions, such as disaster-prevention emails, are suspended.
Information involved
Email addressUser / member IDPhone numberFull name
Cause / key point
Unauthorized access to the service operator.
Industry
Government & municipal
Listing / capital
Government / public body
Sources
Last updated
October 20, 2026
Email addressUser / member IDPhone numberFull nameHow 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

Related incidents

Browse the database →

Incidents sharing the same company, service, attack method or industry (grouped automatically from the disclosures).

Same attack method

Same industry

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 →

← Back to Breach Watch