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**Name of the Vulnerable Software and Affected Versions** Microsoft SharePoint Server Subscription Edition versions prior to 16.0.19725.20280 Microsoft SharePoint Server 2019 versions prior to 16.0.10417.20128 Microsoft SharePoint Enterprise Server 2016 versions prior to 16.0.5552.1002 **Description** An issue exists in Microsoft Office SharePoint due to the deserialization of untrusted data. Deserialization is the process of converting a data stream back into an object. This flaw allows an authenticated attacker with Site Member permissions to execute arbitrary code remotely over a network without requiring elevated privileges. **Recommendations** Update SharePoint Server Subscription Edition to build 16.0.19725.20280. Update SharePoint Server 2019 to build 16.0.10417.20128. Update SharePoint Enterprise Server 2016 to build 16.0.5552.1002.