HackingRetail & ConsumerRetailVulnerability ExploitData ExfiltratedCustomer Data InvolvedDelayed DiscoverySupply Chain (3P Vendor)Government IDIdentity (basic)MediumContained

Madison Square Garden Entertainment Corp.

bd_6b451934dfaa0e99 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 30, 2025

Filed

Feb 26, 2026

To disclose

13 weeks

Affected

12state residents only

Linked

4 filings

Confidence

66%

Full breach record for Madison Square Garden Entertainment Corp. →5 incidents on file

Madison Square Garden Entertainment Corp. notified the New Hampshire Attorney General of a data breach involving 12 state residents. An unauthorized party exploited a previously undisclosed vulnerability in the Oracle eBusiness Suite (hosted by a third-party vendor) in August 2025, gaining access to names and Social Security numbers. The breach was discovered in late November 2025. Notifications were mailed on February 26, 2026, offering one year of credit monitoring.

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Leak gap clock⏱ Leak >90d13 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 121 days

discovery → filing · 13 weeks / 88 days

Aug 1, 2025

Begins

Nov 30, 2025

Discovered

Feb 26, 2026

Filed

vs. sector median

+5 wks slower

This filing is one of 4 about the same incident.View merged incident

A leak claim by cl0p about this victim predates this filing by 97 days.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Indiana State AGbd_0334e58252a387fe2026-02-26Candidate
Massachusetts State AGbd_b6c209f6588cd0db2026-02-26Verified
Nebraska State AGbd_ddcd5ecbe8f96f1a2026-02-26Verified

Name: Madison Square Garden Entertainment Corp.
norm: madison square garden entertainment
Domain: msgentertainment.com

Name: Madison Square Garden Entertainment Corp.
norm: madison square garden entertainment
Domain: msgentertainment.com
Industry: Retail & Consumerllm

Discovered: Nov 30, 2025
Breach occurred: Aug 1, 2025
Undetected for: 121 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 26, 2026
Affected individuals: 12state-resident count only
Data types: Government IDIdentity (basic)
Data elements: Social Security number
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1078 Valid Accounts
Threat actor: External
Initial access: exploit_public_facing

During the incident: Engaged a forensic firm
Notified law enforcement
Began mailing notification letters via United States Postal Service First-Class mail
Established a dedicated, toll-free call center
Changes made: Vendor successfully implemented measures recommended by Oracle for the application to prevent a recurrence
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 13 weeks(88 days from discovery to filing)
Compliance flags: Leak >90d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGFeb 26 · first

Massachusetts State AGFeb 26 · first

Nebraska State AGFeb 26 · first

New Hampshire State AGFeb 26 · 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/madison-square-garden-entertainment-20260226.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Feb 26, 2026
Raw hash: 1fd367b86f64b8a8100c44bb1e81c77accb1c3993c3962b57085f5b597a9670a

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMadison Square Garden Entertainment Corp.

Victim entityMadison Square Garden Entertainment Corp.

Incidentdiscovered Nov 30, 2025

Stated responseEngaged a forensic firm

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov