California Data Breaches

Educational Testing Service, a contractor for California's student assessments, experienced a data breach between May and September 2026, impacting student data.

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Lexington Medical Center experienced a data breach in 2026, stemming from a third-party vendor, Aesto LLC, which affected approximately 67,000 individuals.

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Perseus House, Inc. experienced a data breach in 2025 where an unauthorized actor accessed systems and copied files, affecting 969 individuals.

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JM Bullion, a precious metals retailer, experienced a data breach in 2026 where unauthorized parties accessed customer information.

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Universal Dermatology & Vein Care experienced a data breach in 2026, affecting 35,295 individuals, as reported to the U.S. Department of Health and Human Services.

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Bolt Web Solutions experienced a data breach in 2026, disclosing it on September 25, 2026, with at least four Massachusetts residents affected and potential exposure of various personal data types.

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Electric Research and Manufacturing Cooperative, Inc. (ERMCO) experienced a data breach in 2026, which was publicly disclosed via a notification to the Massachusetts Attorney General in September 2026. A class-action lawsuit related to this incident was filed in April 2026.

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Desert De Oro Foods experienced a data breach in 2026, where an unauthorized party gained access to a corporate email account and computer, potentially exposing employee HR data.

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Alma Family Services experienced a data breach in 2026, which involved the protected health information of 2,753 individuals, as disclosed to the U.S. Department of Health and Human Services.

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Blackstone Inc. experienced a cybersecurity incident in July 2026 where an unauthorized party accessed employee accounts and copied files from cloud repositories, affecting personal information.

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World Acceptance Corporation, formerly known as World Finance Corporation, experienced a data breach in 2026 that exposed the personal information of over 232,000 individuals.

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Security Industry Specialists (SIS) experienced a data breach disclosed in September 2026, potentially affecting individuals with names and various personal data.

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Sheppard, Mullin, Richter & Hampton LLP reported a data breach in 2026 that may have affected 204,001 individuals, according to a California regulatory listing. Available information does not identify the data types involved.

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Poppins Payroll experienced a data breach in 2026, reportedly exposing the personal information of at least 333 Vermont residents.

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World Acceptance Corporation, also known as World Finance, experienced a data breach in 2026 involving unauthorized access to its network. The incident may have affected approximately 232,401 individuals.

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5Star Life Insurance Company reported a data incident in November 2025, confirmed by a California Attorney General filing in September 2026, which apparently involved a third-party vendor, Paylogix.

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The California Attorney General’s portal lists a Kings United Way data breach dated August 26, 2026, involving names, dates of birth, and Social Security numbers. The number of people affected has not been disclosed.

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MedImpact Healthcare Systems, a pharmacy benefit manager, experienced a data breach in late 2025 that exposed personal and health information of its clients' members. The company began notifying affected individuals in September 2026.

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OneMain Financial Group, LLC experienced a data breach in 2026 that exposed the personal information of at least 17,948 individuals, including names, addresses, and Social Security numbers.

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Opportune LLP experienced a 2026 data breach involving unauthorized access to data on June 22, 2026. Available reports identify Social Security numbers and at least 56 affected Vermont individuals; the full affected population remains unclear.

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NSE Insurance Agencies was named in a reported data breach investigation in 2026 after a California regulatory listing described a hacking or IT incident. The affected data and number of people involved have not been disclosed in the available information.

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Astrana Health, Inc. disclosed a 2026 data breach involving social engineering and unauthorized access to private or confidential information. The company has not disclosed the number of affected people or confirmed which specific data types were accessed.

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