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Advantest Confirms Data Breach Following February Ransomware Attack

Advantest Confirms Data Breach Following February Ransomware Attack

First seen 7 Oct 2026, 15:57 UTC • •
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ThreatCluster AI
ThreatCluster •October 7, 2026 at 17:29 UTC
  • •Advantest confirmed a data breach affecting personal information due to a ransomware attack.
  • •Over 500 California residents are reported to be impacted, along with others in Massachusetts and Vermont.
  • •The company is offering 18 months of free credit monitoring to affected individuals.

Advantest, a Japanese semiconductor testing company, has disclosed that personal information was stolen during a ransomware attack in February 2026. The breach, which was initially reported in February, involved unauthorized access to its systems, with data including names, Social Security numbers, and financial information being compromised. Notifications sent to affected individuals on October 6, 2026, indicated that over 500 California residents were impacted, alongside smaller numbers in Massachusetts and Vermont. Advantest has not confirmed the total number of individuals affected or whether the data has been misused. The company is offering 18 months of free credit monitoring to those affected. No ransomware group has claimed responsibility for the attack, and the incident has been contained with the network restored.

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Timeline

2026-01-23
Ransomware attack occurred
Unauthorized access to Advantest's systems led to data extraction. The breach date was listed in the California AG filing.
X
2026-02-15
Initial breach disclosure
Advantest reported a ransomware attack but could not confirm the extent of data exfiltration at that time.
Bleepingcomputer
2026-10-06
Data breach notifications sent
Advantest notified affected individuals about the stolen personal information and offered credit monitoring services.
Securityweek

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Common questions

What personal information was stolen?
The stolen data includes names, Social Security numbers, passport numbers, and financial information.
How many individuals are affected?
Over 500 individuals in California are reported to be affected, with additional individuals in Massachusetts and Vermont.
What should affected individuals do?
Affected individuals should enroll in the offered 18 months of free credit monitoring and remain vigilant against phishing attempts.