This security update resolves a cross-site-scripting (XSS) vulnerability that exists if Microsoft SharePoint Server does not correctly sanitize a specially crafted web request to an affected SharePoint server. This update also resolves a remote code execution vulnerability that exists in Microsoft SharePoint if the software does not check the source markup of an application package. To learn more about the vulnerabilities, see the following security advisories:
- Microsoft Common Vulnerabilities and Exposures CVE-2020-0923
- Microsoft Common Vulnerabilities and Exposures CVE-2020-0931
- Microsoft Common Vulnerabilities and Exposures CVE-2020-0980
Note To apply this security update, you must have the release version of Microsoft SharePoint Server 2019 installed on the computer.