Commonwealth Business Bank Data Breach | Data Privacy Lawsuit

If your personal information was exposed in the Commonwealth Business Bank data breach, you do not have to face the risks alone. Data breach laws in California give consumers the ability to hold companies accountable when they fail to safeguard sensitive data. An experienced data privacy and cybersecurity attorney can help you understand your rights, join collective legal actions if appropriate, and pursue compensation for any harm caused by the breach.

What happened at Commonwealth Business Bank?

In February 2025, Commonwealth Business Bank (CBB), a community bank serving California and beyond, identified suspicious activity on its computer network. Following an extensive investigation, the bank determined that an unauthorized party gained access to its systems between January 25 and February 8, 2025. On August 13, 2025, the bank began mailing out data breach notification letters to affected individuals, as required by California law.

This breach has raised concerns among customers and regulators about the security of sensitive personal information and the ongoing risks of financial fraud. According to filings with the California Attorney General’s Office, Commonwealth Business Bank’s investigation revealed that an unauthorized actor had access to certain files on its systems and the breach lasted roughly two weeks before detection.

What Information Was Exposed?

The official filings indicate that affected information may include:

• Full names

• Personal identifiers (which may vary by individual, based on the bank’s records)

• Potential financial details

Because banks often store highly sensitive customer information, including account numbers, routing details, or Social Security numbers, any confirmed exposure significantly increases the risk of identity theft. At present, Commonwealth Business Bank has not publicly disclosed the exact categories of data for all victims, but the notice suggests that personal and financial information were at risk.

Risks for Victims of the CBB Data Breach

Data breaches involving financial institutions carry unique dangers. Consumers impacted by the Commonwealth Business Bank incident may face:

• Identity theft and fraud: Cybercriminals could use personal data to open fraudulent credit accounts, apply for loans, or drain bank accounts.

• Tax fraud: With enough personal identifiers, attackers can file false tax returns and intercept refunds.

• Long-term exposure: Unlike a credit card number that can be canceled, stolen Social Security numbers and financial records cannot easily be replaced.

Legal Rights and Options for Affected Consumers

California has some of the strongest privacy protections in the nation. Under the California Consumer Privacy Act (CCPA) and other state laws, consumers whose data is compromised in a preventable breach may have grounds to pursue legal action.

If negligence in cybersecurity practices contributed to the incident, impacted individuals could be entitled to:

• Compensation for financial losses and expenses related to identity theft

• Credit monitoring and identity theft protection services

• Statutory damages under California privacy law

Class action lawsuits are a reasonable response to banking sector data breaches, and consumers affected by the CBB breach should explore their legal options. Contact our data breach lawyers to learn more about the class action process and to consider taking legal action.