AccidentalFinancial ServicesFinanceMisdeliveryCustomer Data InvolvedIdentity (basic)Financial accountLowContained

Arvest Bank

bd_f8dee04fc3f8275b · schema v1 · pii pii-v2

Severity

Low

Discovered

Apr 24, 2025

Filed

May 9, 2025

To disclose

—

Affected

Not disclosed

Linked

5 filings

Confidence

65%

Full breach record for Arvest Bank →4 incidents on file

Arvest Bank experienced a technical error during system updates on April 24, 2025, which temporarily allowed customer accounts to be viewable by other customers during online banking. The incident involved the disclosure of customer names, account numbers, balances, and activity. Arvest Bank restored services by April 25, 2025, and is offering one year of complimentary credit monitoring and identity theft recovery services to affected customers.

J jump to incidentP pin to compareR raw source

Incident timeline

Apr 24, 2025

Begins

Apr 24, 2025

Discovered

May 9, 2025

Filed

This filing is one of 5 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (4) · sorted by filing gap

Indiana State AGbd_d0a61da95843881f2025-05-09Verified
Maine State AGbd_04cbfdb0ec5567b52025-05-12 · +3dCandidate
Indiana State AGbd_579edf1c4045581b2025-05-30 · +21dCandidate
Nebraska State AGbd_e1bed42dae8c79502025-05-30 · +21dVerified

Name: Arvest Bank
norm: arvest bank

Name: Arvest Bank
norm: arvest bank
Industry: Financial Servicesllm

Discovered: Apr 24, 2025
Breach occurred: Apr 24, 2025 – Apr 24, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Apr 25, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)Financial account
Attack vector: Misconfiguration
MITRE ATT&CK: T1535 Unauthorized Access to Cloud Storage

During the incident: Temporarily disabled some online banking functions until the issue was fixed
Fully restore online banking and Arvest Go by the afternoon of Friday, April 25, 2025
Changes made: Providing Credit Monitoring and Fully Managed Identity Theft Recovery coverage to all customers with affected accounts
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 · 5 filings · 3 states

View merged incident ↗

Indiana State AGMay 9 · first

Nebraska State AGMay 9 · first · this page

Maine State AG+3d

Indiana State AG+21d

Nebraska State AG+21d

Pattern: first filing May 9 (IN), last May 30 (NE) — a 21-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://nebraska.gov/ago/data-breach/documents/5bf49a67-220b-4914-ada9-0cb8ecc8bfa7.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 9, 2025
Raw hash: 28662b851f6e58149e83bbf1cac68bfd28d91f1efe5e62e3717af02e78886201

Linked disclosures

Regulatory filings (4) · sorted by filing gap

Reporting entityArvest Bank

Victim entityArvest Bank

Incidentdiscovered Apr 24, 2025

Stated responseTemporarily disabled some online banking functions until the issue was fixed

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancenebraska.gov