HackingOtherVulnerability ExploitZero-DayData ExfiltratedSupply Chain (3P Vendor)Identity (basic)Government IDMediumContained

Madison Square Garden Entertainment Corp.

bd_eaa3e48a101e2936 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 30, 2025

Filed

Feb 26, 2026

To disclose

13 weeks

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. reported a data breach affecting 11 Maine residents. An unauthorized person exploited a previously undisclosed condition (zero-day) in the Oracle eBusiness Suite, hosted by a vendor, to access data in August 2025. The investigation determined access occurred between August 10 and October 21, 2025, and was discovered in late November 2025. Names and Social Security numbers were exposed. Notifications were sent on February 26, 2026, offering one year of credit monitoring.

J jump to incidentP pin to compareR raw source

Maine clockDiscovered Nov 30, 2025 → Filed with AG Feb 26, 202688d ⏱ ME AG >30d13 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 · 112 days

discovery → filing · 13 weeks / 88 days

Aug 10, 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

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitecl0pbd_66b8b6b5e23d3e102025-11-21 · +97dVerified

Regulatory filings (2) · sorted by filing gap

Illinois State AGbd_02be98701ea33a0f2026-02-01 · +25dVerified by operator
Massachusetts State AGbd_592875e108e76ee72025-08-20 · +190dVerified by operator

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: Otherllm

Discovered: Nov 30, 2025
Breach occurred: Aug 10, 2025 – Oct 21, 2025
Undetected for: 112 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 26, 2026
Affected individuals: 11state-resident count only
Data types: Identity (basic)Government ID
Data elements: Social Security number
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1078 Valid Accounts
Threat actor: ExternalFinancial
Regulator citations: Filed notice with Maine Attorney General
Initial access: exploit_public_facing

During the incident: Engaged a forensic firm
Notified law enforcement
Established a dedicated, toll-free call center
Offered one year of complimentary credit monitoring and identity protection services
Changes made: Vendor 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: ME AG >30d · 88d
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.
Clock breakdown: Statute Window Elapsed Threshold Status
Maine
Discovered: Nov 30, 2025
→ Filed with AG: Feb 26, 2026
88d 30 days (soft) ME AG >30d

Statute	Window	Elapsed	Threshold	Status
Maine	Discovered: Nov 30, 2025 → Filed with AG: Feb 26, 2026	88d	30 days (soft)	ME AG >30d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 3 filings · 3 states

View merged incident ↗

Massachusetts State AGAug 20 · first

Illinois State AG+165d

Maine State AG+190d · this page

Pattern: first filing Aug 20 (MA), last Feb 26 (ME) — a 190-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://www.maine.gov/agviewer/content/ag/985235c7-cb95-4be2-8792-a1252b4f8318/44a0bea6-9a88-49c9-81ed-3b6f388f9f8b.html
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: ca2a827a91b2fb392fe944566056607a8a5203df35b8c8583226d3264f526780

Linked disclosures

Ransomware claims (1)

Regulatory filings (2) · 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

ComplianceME AG >30d

Extraction provenanceno artifact recorded

Source provenancewww.maine.gov