HackingOtherCustomer Data InvolvedDelayed DiscoveryPIIIdentity (basic)LowContained

MUSEUM ASSOCIATES

bd_6c665346b95691ea · schema v1 · pii pii-v2

Severity

Low

Discovered

Jul 11, 2025

Filed

Aug 24, 2026

To disclose

14 months

Affected

Not disclosed

Linked

3 filings

Confidence

65%

Full breach record for MUSEUM ASSOCIATES →

LACMA (Museum Associates) notified individuals of a data breach where an unauthorized third party accessed its network from July 7-11, 2025. Suspicious activity was detected on July 11, 2025. The incident involved personal information including names and addresses. LACMA engaged third-party cybersecurity experts and a data-review firm, notified law enforcement, and is offering one year of complimentary identity theft protection services via FinancialShield. This is an updated notice.

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California clockDiscovered Jul 11, 2025 → Notified Aug 24, 2026409d ✗ CA 60-day late14 months discovery → filing

Incident timeline

undetected · 4 days

discovery → filing · 14 months / 409 days

Jul 7, 2025

Begins

Jul 11, 2025

Discovered

Aug 24, 2026

Filed

vs. sector median

+51 wks slower

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Vermont State AGbd_9e9b360babb7e6d72026-08-25 · +1dVerified
Massachusetts State AGbd_3bb176e1fd3d7ef62026-08-01 · +23dVerified

Name: MUSEUM ASSOCIATES
norm: museum associates

Name: MUSEUM ASSOCIATES
norm: museum associates
Also named: Museum Associatesdba oflegal entity
Los Angeles Museum of Art (LACMA)dba oftrade name
Industry: Otherllm

Discovered: Jul 11, 2025
Breach occurred: Jul 7, 2025 – Jul 11, 2025
Undetected for: 4 daysoccurrence → discovery
Materiality determined: —
Notification sent: Aug 24, 2026
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External

During the incident: Promptly began working with third-party cybersecurity experts to investigate and remediate that activity
Engaged a data-review firm to analyze those files’ contents
Notified law enforcement
Changes made: Offering a complimentary one-year membership to FinancialShield
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 14 months(409 days from discovery to filing)
Compliance flags: CA 60-day late · 409d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Jul 11, 2025
→ Notified: Aug 24, 2026
409d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Jul 11, 2025 → Notified: Aug 24, 2026	409d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Massachusetts State AGAug 1 · first

California State AG+23d · this page

Vermont State AG+24d

Pattern: first filing Aug 1 (MA), last Aug 25 (VT) — a 24-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

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/sb24-628808
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 24, 2026
Raw hash: 18c92b12317e35896ece36f3ba9dd3a625a6c6d97f2709d86508f1843b42c8e2

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityMUSEUM ASSOCIATES

Victim entityMUSEUM ASSOCIATES

Incidentdiscovered Jul 11, 2025

Stated responsePromptly began working with third-party cybersecurity experts to investigate and remediate that activity

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov