HackingTelecom & MediaProfessional ServicesInformationVulnerability ExploitSupply Chain (3P Vendor)Customer Data InvolvedEmployee Data InvolvedIdentity (basic)Government IDMediumContained

The Madison Square Garden Family of Companies

bd_e7bdd410442df1ae · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 30, 2025

Filed

Feb 26, 2026

To disclose

13 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

65%

The Madison Square Garden Family of Companies notified California residents of a data breach involving their Oracle eBusiness Suite. An unauthorized person exploited a previously undisclosed vulnerability in the application, hosted by a third-party vendor, to access data in August 2025. The investigation determined in late November 2025 that files containing names and Social Security numbers were accessed. The company engaged forensic investigators, notified law enforcement, and is offering one year of complimentary credit monitoring services.

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California clockDiscovered Nov 30, 2025 → Notified Feb 23, 202685d ✗ CA 60-day late13 weeks discovery → filing

Incident timeline

undetected · 121 days

discovery → filing · 13 weeks / 88 days

Aug 1, 2025

Begins

Nov 30, 2025

Discovered

Feb 26, 2026

Filed

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

Part of ORACLE CORPORATION supply-chain incident (2025) — a supply-chain cascade affecting multiple organizations.View cascade →

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Vermont State AGbd_39f83d65f30204f12026-02-26Candidate

Name: The Madison Square Garden Family of Companies
norm: madison square garden family of companies
Domain: msgentertainment.com

Name: The Madison Square Garden Family of Companies
norm: madison square garden family of companies
Domain: msgentertainment.com
Industry: Telecom & MediallmProfessional Servicesllm

Discovered: Nov 30, 2025
Breach occurred: Aug 1, 2025 – Aug 31, 2025
Undetected for: 121 daysoccurrence → discovery
Materiality determined: —
Notification sent: Feb 23, 2026
Affected individuals: Not disclosed
Data types: Identity (basic)Government ID
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1195 Supply Chain Compromise
Threat actor: External
Initial access: exploit_public_facing

During the incident: Engaged a forensic firm
Notified law enforcement
Arranged for complimentary one-year credit monitoring, credit report, and credit score services through Cyberscout
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: CA 60-day late · 85dCA AG copy ≤15d · 3d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Nov 30, 2025
→ Notified: Feb 23, 2026
85d 60 days (analyst band, pre-2026 discoveries) CA 60-day late
California
Consumers notified: Feb 23, 2026
→ AG copy submitted: Feb 26, 2026
3d 15 calendar days CA AG copy ≤15d

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Nov 30, 2025 → Notified: Feb 23, 2026	85d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late
California	Consumers notified: Feb 23, 2026 → AG copy submitted: Feb 26, 2026	3d	15 calendar days	CA AG copy ≤15d

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Vermont State AGFeb 26 · first

California 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://oag.ca.gov/ecrime/databreach/reports/sb24-619390
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: e11edad61b160fc3ebc279107407b7a2f0139ee566eb6a71a0b0ee753fa692ff

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityThe Madison Square Garden Family of Companies

Victim entityThe Madison Square Garden Family of Companies

Incidentdiscovered Nov 30, 2025

Stated responseEngaged a forensic firm

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov