The Middlefield Banking Company

The Middlefield Banking Company notified California AG on Dec 21, 2023 of a data breach, which occurred on Apr 11, 2023. Data exposed: Passport number, Date of birth, Name.

Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization: The Middlefield Banking Company
Source: California AG · source record
Date reported: Dec 21, 2023
Date(s) of breach: Tuesday, April 11, 2023
Residents affected: Not published by this source
Data exposed: Passport number Date of birth Name
Notice letter: Sample notice (PDF)
Discovered: Nov 21, 2023, as stated in the letter
"We recently concluded our review and determined on or around November 21, 2023 that information related to you was included in the potentially impacted data set."
Days to notice: 30 days from discovery (Nov 21, 2023) to the California record (Dec 21, 2023). Statute: 30 days from discovery or notification of the breach (Cal. Civ. Code § 1798.82).
Offered in the letter: 12 months of credit or identity monitoring through Experian
First seen by BreachTally: 2026-10-30 15:42 UTC

Dates and counts as filed by the organization with the agency. The breach window and the report date often differ by months.

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Data reproduced from a public government filing. Spot an error? Email support@breachtally.com with the record link. Corrections are applied and noted.