HackingIdentity (basic)LowContained

Bison State Bank

bd_42961be50ed4c80f · schema v1 · pii pii-v2

Severity

Low

Discovered

Apr 17, 2025

Filed

Jan 26, 2026

To disclose

—

Affected

Not disclosed

Linked

3 filings

Confidence

65%

Full breach record for Bison State Bank →

Bison State Bank notified Nebraska residents of a data breach involving unauthorized access to a single email account between April 17, 2025, and June 30, 2025. The incident involved personal information, including names. The bank secured its network, engaged external cybersecurity professionals, and is offering complimentary credit monitoring services to affected individuals. No evidence of misuse was found.

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Incident timeline

Apr 17, 2025

Begins

Apr 17, 2025

Discovered

Jan 26, 2026

Filed

This filing is one of 3 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (2) · sorted by filing gap

Massachusetts State AGbd_add33ee7a75f7c682026-01-31 · +5dVerified
New Hampshire State AGbd_d61fffe9af8336282026-02-09 · +14dCandidate

Name: Bison State Bank
norm: bison state bank

Name: Bison State Bank
norm: bison state bank

Discovered: Apr 17, 2025
Breach occurred: Apr 17, 2025 – Jun 30, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jan 26, 2026
Affected individuals: Not disclosed
Data types: Identity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Initial access: valid_credentials

During the incident: Secured our network
Worked very closely with external cybersecurity professionals
Conducted a thorough review of the potentially impacted data
Providing you with 12/24 months of Single Bureau Credit Monitoring and identity theft protection services through IDX
Changes made: Continually evaluate and modify our practices and internal controls to enhance the security and privacy of your personal information
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 · 3 filings · 3 states

View merged incident ↗

Nebraska State AGJan 26 · first · this page

Massachusetts State AG+5d

New Hampshire State AG+14d

Pattern: first filing Jan 26 (NE), last Feb 9 (NH) — a 14-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/104f2b47-0ac1-483e-a1b9-2ca1cc3f8aca.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jan 26, 2026
Raw hash: c6d16e8deb2e0c178b511898305a21144f8cccc751f32b2323db627071779a3a

Linked disclosures

Regulatory filings (2) · sorted by filing gap

Reporting entityBison State Bank

Victim entityBison State Bank

Incidentdiscovered Apr 17, 2025

Stated responseSecured our network

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancenebraska.gov