Skip to content
JAENES
BPossible leakNovember 5, 2026 announced

損害保険ジャパン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
October 29, 2026
Announced on
November 5, 2026
Severity
BIncidents centered on names and contact details.
Scale
65,000 records
Main impact
Due to unauthorized access to contractor PCS, approximately stored customer information of 損保ジャパン used for inquiry and reception management operations — 約6万5,000件 — may have been leaked; it may include names, contact details, addresses, and vehicle registration numbers.
Information involved
Full namePhone numberHome address
Cause / key point
An unauthorized access that reportedly exploited misconfigurations in access control and authentication credential management settings of a web application operated by the contractor.About Abuse of credentials
Industry
Finance & insurance
Listing / capital
Listed company
Sources
Last updated
November 7, 2026

Where to go for this information

The steps themselves are on the protection guide. These links match the kinds of data in this incident, plus support contacts.

Ask AI about this incident

Opens an AI chat with this page's URL already in the prompt. Treat the answer as a starting point — always verify with the official sources listed above.

Ask ChatGPT ↗Search Perplexity ↗

Full namePhone numberHome 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

Related incidents

Browse the database →

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

Incidents related to "ジャパン"

Incidents where the damage spread through the same service or system.

Same attack method

Same industry

Attack method classification: Abuse of credentials(Logging in legitimately with leaked or guessed passwords)

Read the Abuse of credentials guide and national trends →

← Back to Breach Watch