Chinese nation-state groups exploiting SharePoint vulnerability, Microsoft confirms At least two Chinese nation-state threat groups are targeting internet-facing SharePoint servers via several recently disclosed vulnerabilities, Microsoft warned customers on Tuesday. In addition to the two confirmed nation-state groups — identified as Linen Typhoon and Violet Typhoon — Microsoft said it found another China-based group attacking SharePoint servers. The attribution follows an urgent alert about threat actors exploiting vulnerabilities in on-premises instances of Microsoft SharePoint, which thousands of organizations globally use to manage content, collaborate and share documents. The campaign of attacks set off alarms among defenders because of its use among governments, large corporations,…