ユーザベース（NewsPicks）Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- October 8, 2026
- Severity
- AFinancial and HR records — information that easily translates into monetary damage.
- Scale
- 362,000 records
- Main impact
- It was reported that unauthorized access to an administrative tool may have exposed up to メール最大32.3万件 of email addresses and up to カード情報の一部最大36.2万件 of partial card information, among other data; items overlap and the totals are not a count of individuals.
- Information involved
- Email addressCard & payment dataPhone numberHome addressFull nameDate of birth
- Cause / key point
- Unauthorized access exploiting a vulnerability in a business administrative management tool.About Exploitation of vulnerabilities
- Industry
- Media & entertainment
- Listing / capital
- Unlisted
- Sources
- Last updated
- October 20, 2026
Is this incident worth paying attention to?
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: Exploitation of vulnerabilities(Breaking in through holes in software and devices)
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