Mimecast acknowledged Wednesday that the threat actor responsible for the SolarWinds attack used the supply chain compromise to gain entry to a part of Mimecast’s production grid environment, accessing certain Mimecast-issued certificates and related customer server connection information.
In an incident report, Mimecast researchers said the threat actor also accessed a subset of email addresses and other contact information, as well as encrypted and/or hashed and salted credentials. The company said the threat actor also accessed and downloaded a limited number of its source code repositories, but Mimecast found no evidence of any modifications to its source code nor does it believe there was any significant impact on any Mimecast products.
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