Where does the Columbia Bank case file come from?

Every entry is taken from the breach report Columbia Bank lodged with the California Attorney General. Nothing here is estimated.

Why do the incident date and the report date differ?

Companies usually investigate before they report. The gap between the two dates shows how long that took.

What does the records-affected figure count?

It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.

Does this case file change over time?

Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

Case file

Case File: Columbia Bank Data Breach

This file collects the dated facts on record for the Columbia Bank incident. The state report is dated April 17, 2026. The incident itself is dated October 2, 2025.

Timeline

197 days separate the incident date from the date it was reported.

October 2, 2025Incident dateWhen the filing says the breach took place.
April 17, 2026Report filed in CaliforniaDate the notice was lodged with the California Attorney General.

Case facts

Filing state: California
Date reported: April 17, 2026
Incident date: October 2, 2025
Receiving office: California Attorney General

Case notes

Columbia Bank officially reported a data breach to the California Attorney General's office on April 17, 2026. This filing confirms that sensitive personal information maintained by the bank was accessed by unauthorized parties.

The breach event occurred on October 2, 2025. According to the filing, digital attackers managed to gain access to consumer files held within Columbia Bank's network. The specifics of how the compromise occurred or the exact type of breach have not been detailed.

When personal information becomes exposed in such an incident, there are immediate risks to those affected. Unauthorized access to your data could potentially lead to attempts at identity theft, financial fraud, or other malicious activities by bad actors.

To safeguard against potential misuse of their information, individuals should closely monitor their financial account statements and credit reports for any unusual or unauthorized activity. It is also wise to remain cautious of unexpected communications, such as emails or phone calls, that request personal details.

This documentation is based on information publicly filed by Columbia Bank with regulatory authorities. Individuals who receive an official notification from Columbia Bank regarding this security incident should review it carefully for any specific guidance or additional details provided.

Questions about this case file

Where does the Columbia Bank case file come from?: Every entry is taken from the breach report Columbia Bank lodged with the California Attorney General. Nothing here is estimated.
Why do the incident date and the report date differ?: Companies usually investigate before they report. The gap between the two dates shows how long that took.
What does the records-affected figure count?: It is the number the company gave the state. It can cover residents of that state only, so the national total may be higher.
Does this case file change over time?: Yes. When a company files an update or a new state publishes its copy of the report, the dates and counts here are refreshed.

California data breaches

Filing source: California Attorney General

Named in the Columbia Bank breach?

Attach your notice and a short note. An attorney checks it against this case file at no cost.

Timeline

Case facts

Case notes

Questions about this case file

More California case files