読宣WEST（読宣）Data breach / unauthorized access incident
- Occurred on
- October 14, 2026
- Announced on
- October 26, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- 1,700 people
- Main impact
- Unauthorized access to the 四国支社 website may have resulted in the leak of at least 1700 customers' names, addresses, and telephone numbers.
- Information involved
- Full nameHome addressPhone number
- Cause / key point
- It was announced that unauthorized access to the 四国支社 website may have caused information to be leaked.
- Industry
- Media & entertainment
- Sources
- Last updated
- October 27, 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 →