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Updated 16 days ago

Columbia Banking System Data Breach

▼ Key takeaways

•Reports suggest a potential breach involving Columbia Banking System.
•Discovered on September 23, 2026.
•Possible data exposed: SSN, Financial Account.
•Confirmation level: Based on reports.

Detailed summary

A ransomware tracker listed Columbia Banking System, associated with columbiabank.com and umpquabank.com, on September 23, 2026, and attributed the listing to the Clop group. The available information does not include an official company disclosure or regulator filing confirming the incident.

The number of affected individuals and the types of information involved have not been disclosed in the available source. It does not establish whether Social Security numbers, financial account data, or medical information were affected. No consumer notification or regulatory notice date is confirmed. Further details may emerge as reporting develops.

Data possibly involved

SSN
Can be used to open fraudulent accounts and file false tax returns
Financial Account

Company Response Timeline

Breach Occurred

Sep 23, 2026

Company Discovered

Unknown

Regulator Notified

Unknown

Consumers Notified

Unknown

Breach Verification Status

Reports Only

Current

Initial dark web reports of potential breach

Company Confirmed

Company has acknowledged the breach

Regulator Confirmed

Confirmed by regulatory authorities

Note: Breach verification can take time. Information may evolve as more details become available from companies and regulators.

Case Status:

Monitoring

We're monitoring this situation for developments.

Were You Affected By This Breach?

If you are a customer or have received a data breach notification, you may submit your information as part of our ongoing investigation. Submitting your information is free and does not obligate you.

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Check Your Risk Level

Answer a few questions to understand how this breach might affect you

Do you use Columbia Banking System?

Yes

What should I do?

Change your passwords

Update passwords for the affected service and any accounts using the same password

Enable two-factor authentication

Add an extra layer of security to your accounts

Monitor your accounts

Watch for suspicious activity on your financial and online accounts

Watch for phishing attempts

Be cautious of emails or messages claiming to be from the affected company

Consider a credit freeze

Prevent unauthorized access to your credit report

Scan your email for other exposures

Check whether this address shows up in other known breaches. Free, no account.

Get your info off data-broker sites

Data Shield files removal requests with every broker that accepts an authorized agent, and gives you the exact link or letter for the brokers that only accept requests from you.

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