Frost Bank Reports Data Security Incident in California (2026)

Frost Bank filed a data breach notification with California authorities on May 20, 2026, stemming from an incident dated December 6, 2025. The breach exposed sensitive personal and financial information, including Full Name, Social Security Number, and Financial Account Number. Individuals affected may face increased risks of fraud or identity theft from this event.

State: California
Breach date: December 6, 2025
Reported: May 20, 2026

What may have been exposed

Full Name
Social Security Number
Financial Account Number
Routing Number
Date of Birth
Credit Score Information
Transaction History
Mailing Address

Frost Bank submitted a data breach notification to California regulators on May 20, 2026, related to a security incident dated December 6, 2025. This filing is available in public records. The nature of the breach type was unspecified in the public report, and an investigation into the incident is ongoing.

The reported incident led to the exposure of several categories of personal and financial data. This includes Full Name, Social Security Number, Financial Account Number, Routing Number, Date of Birth, Credit Score Information, Transaction History, and Mailing Address.

The compromise of these data types, particularly financial identifiers and personal details, can create risks for those affected. Individuals may face an increased potential for identity theft, financial fraud, or unauthorized use of their personal information.

To help protect themselves, individuals who received a notification from Frost Bank should regularly review their account statements and credit reports for any unauthorized activity. Consider placing a fraud alert on credit files or a security freeze with credit bureaus. Always be wary of unexpected emails, texts, or calls asking for personal details.

What to do if you were affected

Based on the categories of information reported in this filing, these steps can help limit the risk of identity theft and fraud.

Freeze your credit
Place a free credit freeze with Equifax, Experian, and TransUnion. A freeze blocks new accounts from being opened in your name and can be lifted anytime.
Watch your financial accounts
Review bank and card statements for unfamiliar activity and turn on transaction alerts. Report anything you don't recognize to your bank right away.
Stay alert to targeted scams
Be cautious of calls, texts, or emails that reference this breach. Legitimate organizations won't ask you to confirm sensitive details through an unsolicited message.
Keep your notification letter
Save the notice you received. It documents that your information was involved and is often needed to enroll in any credit monitoring offered or to join a related legal claim.

Source: California Attorney General filing

Related data breach cases

Browse all California data breaches View the full case directory