MisuseFinancial ServicesFinancePrivilege AbuseEmployee Data InvolvedCustomer Data InvolvedIdentity (basic)Government IDFinancial accountFinancial credentialsMediumContained

Citibank N.A.

bd_a7433d49e6735ade · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 10, 2023

Filed

May 16, 2023

To disclose

5 weeks

Affected

1state residents only

Confidence

64%

Full breach record for Citibank N.A. →51 incidents on file

Citibank, N.A. notified Montana residents of an insider threat incident where an employee improperly accessed credit card and personal information between Jan 26 and Apr 10, 2023. Affected data included SSN, DOB, and full card details. The employee was terminated, cards reissued, and credit monitoring offered.

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Incident timeline

undetected · 74 days

discovery → filing · 5 weeks / 36 days

Jan 26, 2023

Begins

Apr 10, 2023

Discovered

May 16, 2023

Filed

vs. sector median

4 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1 affectedView incident

Name: Citibank N.A.
norm: citibank na
Domain: citi.com

Name: Citibank N.A.
norm: citibank na
Domain: citi.com
Industry: Financial Servicesllm

Discovered: Apr 10, 2023
Breach occurred: Jan 26, 2023 – Apr 10, 2023
Undetected for: 74 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 12, 2023
Affected individuals: 1state-resident count only
Data types: Identity (basic)Government IDFinancial accountFinancial credentials
Data elements: Social Security numberDate of birth
Attack vector: Insider
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: Internal
Initial access: insider_action

During the incident: Initiated an investigation
Employee in question has been terminated
Credit card was cancelled and a card with a new account number was issued
Arranged for enrollment in Experian IdentityWorks at no cost for up to 12 months
Changes made: Continue to use ongoing measures to protect account and personal information
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(36 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-280.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 16, 2023
Raw hash: a80706472cc2efcd92b987ec3bacec41459686d86212cac8e8095fe3de84a434

Reporting entityCitibank N.A.

Victim entityCitibank N.A.

Incidentdiscovered Apr 10, 2023

Stated responseInitiated an investigation

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancedojmt.gov