Social EngineeringFinancial ServicesTechnologyFinancePhishingStolen CredentialsCustomer Data InvolvedTargetedIdentity (basic)Financial accountMediumActive

COINBASE, INC.

bd_72c7989c67aa78df · schema v1 · pii pii-v1

Severity

Medium

Discovered

—

Filed

Oct 7, 2021

To disclose

—

Affected · nationwide

6,0007 in this filing

Linked

4 filings

Confidence

66%

Full breach record for COINBASE, INC. →4 incidents on file

Coinbase notified Montana AG of unauthorized access to customer accounts between March and May 2021. Attackers used phishing/social engineering to steal credentials and exploited an SMS 2FA flaw. At least 6,000 customers lost funds. Coinbase reimbursed losses, updated recovery protocols, and offered credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

Mar 1, 2021

Begins

Oct 7, 2021

Filed

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

Linked disclosures

Why this link?

Regulatory filings (3) · sorted by filing gap

Massachusetts State AGbd_ab7cb7d82e3a889b2021-10-13 · +6dVerified
Indiana State AGbd_6106f156a9b2a0972021-09-27 · +10dVerified
California State AGbd_b312e90e0503e80c2021-09-27 · +10dCandidate

Name: COINBASE, INC.
norm: coinbase
Domain: coinbase.com

Name: COINBASE, INC.
norm: coinbase
Domain: coinbase.com
Industry: Financial ServicesllmTechnologyllm

Discovered: —
Breach occurred: Mar 1, 2021 – May 20, 2021
Materiality determined: —
Notification sent: —
Affected individuals: 6,000state + nationwide
Data types: Identity (basic)Financial account
Attack vector: Phishing
MITRE ATT&CK: T1566.002 Spearphishing LinkT1078 Valid AccountsT1119 Automated Collection
Threat actor: ExternalFinancial
Initial access: phishing_link

During the incident: Updated SMS Account Recovery protocols
Depositing funds into affected accounts
Setting up a dedicated phone support line
Providing free credit monitoring
Working closely with law enforcement
Changes made: Encouraged customers to use TOTP or hardware security keys instead of SMS 2FA
Encouraged customers to change passwords
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Indiana State AGSep 27 · first

California State AGSep 27 · first

Montana State AG+10d · this page

Massachusetts State AG+16d

Pattern: first filing Sep 27 (IN), last Oct 13 (MA) — a 16-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/Data-Breach-Notification-19.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 7, 2021
Raw hash: 20179b21dd0966e6c3b7f3a57708293f0cbd8abf153649193d98627beedb63fc

Linked disclosures

Regulatory filings (3) · sorted by filing gap

Reporting entityCOINBASE, INC.

Victim entityCOINBASE, INC.

IncidentPhishing

Stated responseUpdated SMS Account Recovery protocols

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov