HackingTechnologyInformationStolen CredentialsSupply Chain (3P Vendor)Customer Data InvolvedIdentity (basic)Financial accountFinancial credentialsLowContained

Warner Music Group

bd_291443e8a8500296 · schema v1 · pii pii-v1

Severity

Low

Discovered

Aug 5, 2020

Filed

Sep 2, 2020

To disclose

28 days

Affected

310state residents only

Linked

7 filings

Confidence

65%

Full breach record for Warner Music Group →3 incidents on file

Warner Music Group notified Montana residents of a data breach involving its e-commerce websites hosted by an external service provider. Unauthorized access occurred between April 25 and August 5, 2020, potentially exposing names, contact info, and payment card details. WMG engaged forensic experts, notified law enforcement, and offered 12 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 102 days

discovery → filing · 28 days

Apr 25, 2020

Begins

Aug 5, 2020

Discovered

Sep 2, 2020

Filed

vs. sector median

7 wks faster

This filing is one of 7 filings about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (6) · sorted by filing gap

South Carolina State AGbd_07f2cbb6b77f4ab82020-09-02Verified
California State AGbd_4c882e60c07278442020-09-02Verified
Washington State AGbd_adff23c1da81b4972020-09-02Candidate
Indiana State AGbd_13e339efa758f9df2020-09-03 · +1dVerified

Show 2 more filings ↓up to 7d gap

New Hampshire State AGbd_35175c3bfdf953a22020-09-04 · +2dVerified
Massachusetts State AGbd_1d2a6092d2d3c24c2020-09-09 · +7dVerified

Name: Warner Music Group
norm: warner music
Domain: warnermusic.com

Name: Warner Music Group
norm: warner music
Domain: warnermusic.com
Industry: Technologyllm

Discovered: Aug 5, 2020
Breach occurred: Apr 25, 2020 – Aug 5, 2020
Undetected for: 102 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 11, 2020
Affected individuals: 310state-resident count only
Data types: Identity (basic)Financial accountFinancial credentials
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1190 Exploit Public-Facing Application
Threat actor: ExternalFinancial
Regulator citations: notified law enforcement
Third party: via external service provider
Initial access: external_remote_services

During the incident: Launched a thorough forensic investigation with the assistance of leading outside cybersecurity experts
Took steps to address and correct the issue
Notified the relevant credit card providers
Notified law enforcement
Offering identity monitoring services through Kroll for 12 months
Changes made: Address and correct the issue
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 28 days(28 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 7 filings · 7 states

View merged incident ↗

South Carolina State AGSep 2 · first

California State AGSep 2 · first

Washington State AGSep 2 · first

Montana State AGSep 2 · first · this page

Indiana State AG+1d

New Hampshire State AG+2d

Massachusetts State AG+7d

Pattern: first filing Sep 2 (SC), last Sep 9 (MA) — 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.

Source URL: https://dojmt.gov/wp-content/uploads/OCP/Breach-NotificationDetails-202.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Sep 2, 2020
Raw hash: 4a0150ba2c1870e1ac9eb092872a2008402a5906ceaabbe35dd72b51f87ab77d

Linked disclosures

Regulatory filings (6) · sorted by filing gap

Reporting entityWarner Music Group

Victim entityWarner Music Group

Incidentdiscovered Aug 5, 2020

Stated responseLaunched a thorough forensic investigation with the assistance of leading outside cybersecurity experts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov