All Breaches
December 1, 2025 Verified Sensitive Record Healthcare

Sierra Management Group 2025 Data Breach

The Sierra Management Group 2025 data breach involved an unauthorized third party accessing certain company systems between December 2025 and March 2026 and potentially viewing or copying files.

1.3 Thousand
Affected People
2
Data Types
Low
Severity
Yes
Verification

Exposed Data Types

2
Personal information
First and last names

Additional Information

Added DateJuly 27, 2026
Breach DateDecember 1, 2025
Domainsierramanagementgroup.com
SourceCalifornia Attorney General consumer notice and HHS report confirming unauthorized system access and possible file copying
Last Content UpdateJuly 27, 2026

Verification and editorial method

LeakData compares the incident name, date, affected-record count, and exposed data types with accessible sources. Unverified fields are not presented as facts, and records are updated when new evidence becomes available.

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Company Information

Company NameSierra Management Group
SectorHealthcare
CountryUnited States
Websitesierramanagementgroup.com

Risk Level

Low

This breach carries a low level of risk.

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