アイサンテクノロジー株式会社Data breach / unauthorized access incident
- Occurred on
- May 6, 2026
- Announced on
- May 15, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- Unknown
- Main impact
- The company’s website was defaced, resulting in redirects to inappropriate external pages. Details such as counts are not disclosed in the public materials.
- Information involved
- Not specified in the disclosure
- Cause / key point
- The company states it appears to have been caused by partial tampering of a program after a vulnerability in the website was exploited.About Exploitation of vulnerabilities
- Industry
- IT & telecom
- Listing / capital
- Listed company東証スタンダード 4667(アイサンテクノロジー)
- Last updated
- October 20, 2026
Stock price reaction to the disclosureアイサンテクノロジー / 東証スタンダード 4667
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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: Exploitation of vulnerabilities(Breaking in through holes in software and devices)
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