This security update resolves a vulnerability in Microsoft Office that could allow remote code execution if a user opens a specially crafted Office file. To learn more about these vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2017-11826.
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KB3213659 - Microsoft Office Online Server (download) KB4011231 - Microsoft Office Web Apps (download) Supported Operating Systems Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2