HackingTechnologyInformationVulnerability ExploitSupply Chain (3P Vendor)Data ExfiltratedGovernment IDIdentity (basic)MediumContained

Madison Square Garden Entertainment Corp.

bd_ddcd5ecbe8f96f1a · schema v1 · pii pii-v2

Severity

Medium

Discovered

Nov 1, 2025

Filed

Feb 26, 2026

To disclose

—

Affected

11state 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 Nebraska AG that unauthorized access to its Oracle eBusiness Suite occurred in August 2025, exploiting a previously undisclosed vulnerability. The breach exposed names and Social Security numbers of 11 Nebraska residents. Notifications were mailed starting February 26, 2026, offering one year of credit monitoring.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >90d

Incident timeline

undetected · 92 days

Aug 1, 2025

Begins

Nov 1, 2025

Discovered

Feb 26, 2026

Filed

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
New Hampshire State AGbd_6b451934dfaa0e992026-02-26Verified
Massachusetts State AGbd_b6c209f6588cd0db2026-02-26Verified

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: Technologyllm

Discovered: Nov 1, 2025
Breach occurred: Aug 1, 2025
Undetected for: 92 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 26, 2026
Affected individuals: 11state-resident count only
Data types: Government IDIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Initial access: exploit_public_facing

During the incident: Engaged a forensic firm
Notified law enforcement
Offered all notified individuals one year of complimentary credit monitoring and identity protection services
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.

Compliance flags: Leak >90d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGFeb 26 · first

New Hampshire State AGFeb 26 · first

Massachusetts State AGFeb 26 · first

Nebraska 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://nebraska.gov/ago/data-breach/documents/e2c2dd44-0325-41d9-95b0-e9fb8db0e1bb.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: 43641ef51744902996e556bf1a8d845961472e8a95a53354a64bd07a96751294

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityMadison Square Garden Entertainment Corp.

Victim entityMadison Square Garden Entertainment Corp.

Incidentdiscovered Nov 1, 2025

Stated responseEngaged a forensic firm

ComplianceLeak >90d

Extraction provenanceno artifact recorded

Source provenancenebraska.gov