MisuseFinancial ServicesFinancePrivilege AbuseCustomer Data InvolvedCredentialsFinancial accountIdentity (basic)Government IDMediumContained

Ally Bank

bd_cac6ff3ef5b825e0 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 13, 2026

Filed

May 8, 2026

To disclose

25 days

Affected

1state residents only

Confidence

66%

Full breach record for Ally Bank →18 incidents on file

Ally Bank notified Massachusetts and New York residents of a data breach discovered on April 13, 2026. An unauthorized non-Ally employee was inappropriately provided access to customer deposit accounts. Exposed data included names, addresses, SSNs, DOBs, bank account numbers, and transaction details. Ally revoked the employee's access, offered new account numbers, implemented fraud monitoring, and engaged Sontiq (TransUnion) to provide three years of identity theft services.

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Massachusetts clock✓ MA AG ≤30d25 days discovery → filing

Incident timeline

discovery → filing · 25 days

Apr 13, 2026

Discovered

May 8, 2026

Filed

vs. sector median

5 wks faster

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

Name: Ally Bank
norm: ally bank
Domain: ally.com

Name: Ally Bank
norm: ally bank
Domain: ally.com
Industry: Financial Servicesllm

Discovered: Apr 13, 2026
Materiality determined: —
Notification sent: May 6, 2026
Affected individuals: 1state-resident count only
Data types: CredentialsFinancial accountIdentity (basic)Government ID
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During the incident: The non-Ally employee’s access has been revoked
Working through our process to contact you to offer new account number(s)
Implemented supplemental fraud monitoring and controls
Engaged Sontiq, a TransUnion Company at our expense, to provide you with world class ID Theft services
Changes made: Implemented supplemental fraud monitoring and controls to detect and prevent unauthorized activity
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 25 days(25 days from discovery to filing)
Compliance flags: MA AG ≤30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

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://www.mass.gov/doc/2026-727-ally-bank/download
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 8, 2026
Raw hash: b349061c916819398faccdf8a570e0b3d75f389513051994242560726c53331f

Reporting entityAlly Bank

Victim entityAlly Bank

Incidentdiscovered Apr 13, 2026

Stated responseThe non-Ally employee’s access has been revoked

ComplianceMA AG ≤30d

Extraction provenanceno artifact recorded

Source provenancewww.mass.gov