HackingProfessional ServicesProfessional ServicesStolen CredentialsData ExfiltratedCustomer Data InvolvedIdentity (basic)LowContained

Sierra Management Group

bd_f06631072dbae83e · schema v1 · pii pii-v1

Severity

Low

Discovered

—

Filed

Jun 29, 2026

To disclose

—

Affected

Not disclosed

Confidence

65%

Full breach record for Sierra Management Group →2 incidents on file

Sierra Management Group notified the California AG of unauthorized access to its systems by a third party between December 2025 and March 2026. The attacker may have accessed and copied files containing personal information, including names. The incident was contained, and an investigation was conducted. Affected individuals are offered credit monitoring and identity restoration services.

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Leak gap clock⏱ Leak >90d

⚠ no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Incident timeline

Dec 1, 2025

Begins

Jun 29, 2026

Filed

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Sierra Management Group
norm: sierra management
Domain: sierramanagementgroup.com

Name: Sierra Management Group
norm: sierra management
Domain: sierramanagementgroup.com
Industry: Professional Servicesllm

Discovered: —
Breach occurred: Dec 1, 2025 – Mar 31, 2026
Materiality determined: —
Notification sent: Jun 29, 2026
Affected individuals: Not disclosed
Data types: Identity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: External

During the incident: Contained the network
Conducted an investigation with the assistance of outside professionals
Notifying individuals whose personal information was identified in the files that may have been involved in the event
Offering access to 12/24 months of complimentary credit monitoring and identity restoration services through IDX
Changes made: Taken substantial steps to reduce the likelihood of a similar event occurring in the future
Source: Quoted from the filing itself, not independently verified.

Compliance flags: Leak >90d
Discovery-date grounding: no discovery dateNo discovery date was extracted, so no notification clock can be evaluated.

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://oag.ca.gov/ecrime/databreach/reports/sb24-625681
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 29, 2026
Raw hash: ff6bdeb1050e68ba2ebae864b30c1c3c2f4f30022dd177276a3fbe6241d833f6

Reporting entitySierra Management Group

Victim entitySierra Management Group

IncidentUnauthorized Access

Stated responseContained the network

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov