A third-party MongoDB database containing 2.8 million CenturyLink customer records and information was left unprotected exposing the data of several hundred thousand of the tech company’s customers.

The database was found by the security firm Comparitech working with security researcher Bob Diachenko. The initial finding took place on September 15, but it is believed the information had been exposed on the internet for about 10 months, Comparitech reported.

CenturyLink said in a statement sent to Comparitech that “The data involved appears to be primarily contact information and we do not have reason to believe that any financial or other sensitive information was compromised. CenturyLink is in the process of communicating with the affected customers.”

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