Social EngineeringTelecom & MediaInformationPhishingData MishandlingEmployee Data InvolvedData ExfiltratedGovernment IDIdentity (basic)Financial accountMediumContained

Milwaukee Symphony Orchestra

bd_69a0b1a25f177b2b · schema v1 · pii pii-v1

Severity

Medium

Discovered

Jun 10, 2026

Filed

Aug 7, 2026

To disclose

8 weeks

Affected

1state residents only

Linked

2 filings

Confidence

67%

Full breach record for Milwaukee Symphony Orchestra →

Milwaukee Symphony Orchestra, Inc. notified the NH Attorney General of a data incident where an employee inadvertently sent a file containing employee personal information (including SSNs, addresses, and wage/tax data) in response to a phishing email on June 10, 2026. The incident potentially affected 1 New Hampshire resident. MSO engaged forensic professionals, contained the incident, and is providing 24 months of credit monitoring.

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Incident timeline

discovery → filing · 8 weeks / 58 days

Jun 10, 2026

Discovered

Aug 7, 2026

Filed

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Massachusetts State AGbd_a02e16d07f7be7bb2026-08-07Candidate

Name: Milwaukee Symphony Orchestra
norm: milwaukee symphony orchestra
Domain: mso.org

Name: Milwaukee Symphony Orchestra
norm: milwaukee symphony orchestra
Domain: mso.org
Industry: Telecom & Mediallm

Discovered: Jun 10, 2026
Materiality determined: —
Notification sent: Aug 3, 2026
Affected individuals: 1state-resident count only
Data types: Government IDIdentity (basic)Financial account
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing Link
Threat actor: ExternalFinancial
Regulator citations: Notified New Hampshire Attorney General
Initial access: phishing_link

During the incident: Initiated an investigation
Implemented measures to contain the incident
Engaged experienced cybersecurity professionals and legal counsel
Isolated the impacted environment
Began an investigation with the help of a leading forensic security firm
Changes made: Implemented additional administrative and technical safeguards
Providing 24 months of complimentary credit monitoring and identity theft protection services
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 8 weeks(58 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Massachusetts State AGAug 7 · first

New Hampshire State AGAug 7 · first · this page

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://mm.nh.gov/files/uploads/doj/remote-docs/milwaukee-symphony-orchestra-20260807.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Aug 7, 2026
Raw hash: 86d4ecad8dc0b409813d6673c7b2eaba06d422b9ec5d4e999a4ea0c82e6bc509

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityMilwaukee Symphony Orchestra

Victim entityMilwaukee Symphony Orchestra

Incidentdiscovered Jun 10, 2026

Stated responseInitiated an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov