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Nearly 250 million Microsoft Customer Service and Support (CSS) records were found exposed to the Internet in five insecure Elasticsearch databases, Comparitech reports.
The records on those servers contained 14 years’ worth of logs of conversations between support agents and customers, all of which could be accessed by anyone directly from a browser, without any form of authentication.

Each of the five Elasticsearch servers contained an apparently identical set of records, with data spanning between 2005 and December 2019, Comparitech’s security researchers reveal.

While most of the personal information in those records was redacted, many records contained plain text data.
Exposed data in those records included customer email addresses, IP addresses, locations, descriptions of CSS claims and cases, Microsoft support agent emails, internal notes marked as “confidential,” and case numbers, resolutions, and remarks, the researchers say.
 
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