Microsoft last December misconfigured five Elasticsearch servers – each one containing the same data set of 250 million customer support records – leaving their information publicly exposed on the internet, according to researchers.

The data leak was detailed today in a blog post by pro-consumer website Comparitech and separately disclosed in a Microsoft Security Response Center (MSRC) blog post.

The configuration error occurred on Dec. 5, 2019 and was remedied by Dec. 31, shortly after Bob Diachenko, head of Comparitech's security research team, notified Microsoft of the issue. "I immediately reported this to Microsoft and within 24 hours all servers were secured,” Diachenko said. "I applaud the MS support team for responsiveness and quick turnaround on this despite New Year's Eve."

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