Skip to content
JAENES
BPossible leakJuly 23, 2026 announced

株式会社北海道協同組合通信社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 15, 2026
Announced on
July 23, 2026
Severity
BIncidents centered on names and contact details.
Scale
Unknown
Main impact
It was announced that on the 15th there was unauthorized access to the cloud shared folder of the vendor contracted to rebuild the sales management system, and there is a risk of information leakage via the contractor.
Information involved
Phone numberHome addressFull name
Cause / key point
An unauthorized access occurred to the contractor's cloud shared folder.About Supply chain attacks (via vendors & shared services)
Industry
Media & entertainment
Listing / capital
Unlisted

北海道協同組合通信社 is unlisted.

Sources
Last updated
October 20, 2026
Phone numberHome addressFull 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: Supply chain attacks (via vendors & shared services)(Compromising the provider instead of the user)

Read the Supply chain attacks (via vendors & shared services) guide and national trends →

← Back to Breach Watch