DisclosureLens
HackingEducationEducationIdentity (basic)Government IDHigh

Manhattan School of Music

bd_fd215a9ecdda06bf · schema v1 · pii pii-v1

Severity

High

Discovered

Nov 23, 2021

Filed

Feb 18, 2022

To disclose

12 weeks

Affected · nationwide

6,5003 in this filing

Linked

5 filings

Confidence

65%
Full breach record for Manhattan School of Music →2 incidents on file

Manhattan School of Music experienced a data breach where an external actor gained unauthorized access to its systems between April 17, 2021, and June 17, 2021. The breach was discovered on November 23, 2021. The compromised information included names and Social Security numbers of approximately 6,500 individuals. Affected parties were notified on February 18, 2022, and offered one year of credit monitoring and identity theft restoration services.

Maine clockDiscovered Nov 23, 2021 → Filed with AG Feb 18, 202287d ⏱ ME AG >30d12 weeks discovery → filing
⚠ AG web formThe discovery date came from the AG web-form field, which is systematically later than the detection date stated in the letter. Treat the clock as indicative.

Incident timeline

undetected · 220 days
discovery → filing · 12 weeks / 87 days

Apr 17, 2021

Begins

Nov 23, 2021

Discovered

Feb 18, 2022

Filed

vs. sector median

+4 wks slower

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Filing propagation · 5 filings · 5 states

View merged incident ↗
Montana State AGFeb 18 · first
Indiana State AGFeb 18 · first
Maine State AGFeb 18 · first · this page
Massachusetts State AG+4d
New Hampshire State AG+7d

Pattern: first filing Feb 18 (MT), last Feb 25 (NH) — a 7-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.