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JPMorgan Chase is warning 465,000 customers who use prepaid cash cards that their accounts may have been compromised by attackers way back in July of this year.

The company acknowledged that servers for the website had been breached in mid-September, and during the course of the investigation found that the prepaid card accounts may have already been exposed prior to the incident.

The cards are typically issued for tax refunds, to distribute unemployment compensation or for payroll in some instances. The account information is most often stored in an encrypted format, but officials for JPM said that some data may have been available in plain text in log files.

It is assumed that some information has been exfiltrated by the attackers, but officials claim none of the data contained sensitive details such as email addresses, social security numbers or birth dates.

JPM will offer potential victims free credit-monitoring services for one year, but has no plans to reissue cards for the potentially compromised accounts, as there has been no indication that any fraud has been perpetrated in connection with the breach.

Law enforcement has joined the investigation.

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