三浦工業Data breach / unauthorized access incident
- Occurred on
- August 14, 2025
- Announced on
- May 18, 2026
- Severity
- SCompromise of deep personal data or usable credentials.
- Scale
- 5,021 records
- Main impact
- Internal accounts were stolen and unauthorized access occurred, resulting in encrypted data for 5,021 employees etc., including business contact details and system passwords, being leaked or potentially leaked.
- Information involved
- Password
- Cause / key point
- Theft of account credentials by a third party and unauthorized intrusion into the internal network.About Abuse of credentials
- Industry
- Manufacturing
- Listing / capital
- Listed company東証プライム 6005(三浦工業)
- Last updated
- October 20, 2026
Stock price reaction to the disclosure三浦工業 / 東証プライム 6005
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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: Abuse of credentials(Logging in legitimately with leaked or guessed passwords)
Read the Abuse of credentials guide and national trends →