Advantest

advantest.com

CONFIRMED

Advantest Corporation is notifying affected individuals that a ransomware attack earlier this year exposed their personally identifiable data. [...]

Observable Status CONFIRMED

Industry / Sector Technology & Commercial

Incident Classification Network Intrusion & Data Exfiltration

Attributed Threat Actor Unattributed / Unknown

Affected Population Scope Under Audit

First Seen 2026-10-07

Last Updated 2026-10-07

Compromised Data Classes:

Customer / Employee PII Authentication Credentials

Statutory Regulatory Filings:

California Department of Justice: SB-24 Data Breach Notice

OPEN WEIGHTS TELEMETRY • DETERMINISTIC CONFIDENCE

Confidence & Source Corroboration

100% CONFIDENCE

1. Primary Authority CONFIRMED BY REGULATOR Base weight: 65%

2. Evidence Specificity +19% Statutory Filing Verified

3. Corroboration Curve +17% 3 independent domains

4. Timeline & Staleness +3% 3 milestones logged

Corroborated Source Domains:

bleepingcomputer.com securityweek.com oag.ca.gov

STATUTORY REGULATORY DISCLOSURES

Official Regulatory Filings & Legal Compliance Records

1 Verified Statutory Filing

Regulatory Ground Truth Standard: The disclosures below represent formal statutory filings and enforcement records submitted to government regulatory authorities (SEC, State Attorneys General, HHS OCR, FTC, FCC, EU/UK DPAs). In accordance with repository principles, this data is captured exactly as filed by the reporting entity and is never modified, overridden, or synthesized by AI models.

California Department of Justice

SB-24 Data Breach Notice

CONFIRMED BY REGULATOR

Docket / Accession ID Statutory Public Notice

Statutory Filing Date 2026-10-05

Disclosed Impact Scope Under Audit

Evidence Standard Regulatory Ground Truth

Statutory Filing Details & Summary (Preserved As Filed):

Official statutory data breach notification submitted by Advantest America to the California Department of Justice under California Civil Code § 1798.82 (SB-24), disclosing unauthorized access to personal identifiable information of California residents.

View Official Regulatory Filing Document https://oag.ca.gov/ecrime/databreach/reports/sb24-630848

Technical Forensic Briefing

Incident Overview

Advantest, within its operating sector, has been subject to a cybersecurity incident initially observed on 2026-10-07. Ground-truth telemetry indicates the threat activity is currently unconfirmed or under forensic attribution.

Advantest Corporation is notifying affected individuals that a ransomware attack earlier this year exposed their personally identifiable data. [...]

Compromised Assets & Data Scope

The specific volume of affected customer or organizational records remains under active forensic investigation. Primary affected online infrastructure and perimeter domains include advantest.com.

Identified categories of compromised data and impacted assets include:

Customer / Employee PII

Authoritative Directives & Vendor Disclosures

Continuous Telemetry Monitoring: Formal statutory regulatory filings (SEC Form 8-K, State AG portals) and sovereign agency advisories (CISA, NCSC) are continuously monitored via automated ingestion pipeline.

Milestone Timeline (3 events logged)

2026-10-07 10:27 UTC

CONFIRMED BY TARGET

Advantest confirms personal information stolen in ransomware attack

Source: BleepingComputer Report

2026-10-07 12:37 UTC

Media Pickup INDEPENDENT VERIFICATION

Press Coverage: Advantest Discloses Data Breach Months After Ransomware Attack

Source: SecurityWeek Report

2026-10-05 17:00 UTC

CONFIRMED BY REGULATOR

California Attorney General Data Breach Notice (SB-24)

Source: California Attorney General Data Breach Notice (SB-24)

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