HackingFinancial ServicesFinanceStolen CredentialsData ExfiltratedCustomer Data InvolvedSupply Chain (3P Vendor)Identity (basic)Government IDFinancial accountMediumContained

BNY Mellon N.A.

bd_5e59b27a52546541 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Mar 23, 2023

Filed

May 22, 2023

To disclose

9 weeks

Affected

5state residents only

Confidence

66%

Full breach record for BNY Mellon N.A. →

BNY Mellon N.A. notified Montana residents of a third-party vendor breach occurring on or about November 30, 2022. Unauthorized access exposed client names, SSNs, account numbers, and addresses. BNY Mellon discovered the scope on March 23, 2023, and sent notifications on May 11, 2023. No evidence of misuse was found. Affected individuals received two years of credit monitoring via IDX.

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Incident timeline

undetected · 113 days

discovery → filing · 9 weeks / 60 days

Nov 30, 2022

Begins

Mar 23, 2023

Discovered

May 22, 2023

Filed

vs. sector median

1 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed5 affectedView incident

Name: BNY Mellon N.A.
norm: bny mellon na

Name: BNY Mellon N.A.
norm: bny mellon na
Industry: Financial Servicesllm

Discovered: Mar 23, 2023
Breach occurred: Nov 30, 2022
Undetected for: 113 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 11, 2023
Affected individuals: 5state-resident count only
Data types: Identity (basic)Government IDFinancial account
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1078 Valid AccountsT1041 Exfiltration Over C2 Channel
Threat actor: ExternalFinancial
Regulator citations: Vendor reported this to law enforcement
Initial access: trusted_relationship

During the incident: Undertook a comprehensive review to identify any impact to BNY Mellon clients
Conducted our own detailed analysis to understand what information and clients may be impacted
Providing credit monitoring services through IDX for two years at no cost
Providing identity theft protection services through IDX
Working with the vendor to strengthen their controls around our data
Changes made: Vendor implemented specific steps to safeguard against future unauthorized access
Investing heavily in data security controls
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

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/Consumer-notification-letter-300.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 22, 2023
Raw hash: 351435e6a081cbc9a5745e37f5f2ccca5b809248001f9b225f83fa5261bfaee4

Reporting entityBNY Mellon N.A.

Victim entityBNY Mellon N.A.

Incidentdiscovered Mar 23, 2023

Stated responseUndertook a comprehensive review to identify any impact to BNY Mellon clients

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov