This security update resolves the following issues:
- 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.
- A remote code execution vulnerability that exists in Microsoft SharePoint if the software fails to check the source markup of an application package.
To learn more about these vulnerabilities, see Microsoft Common Vulnerabilities and Exposures CVE-2020-0923 and Microsoft Common Vulnerabilities and Exposures CVE-2020-0931.
Note To apply this security update, you must have the release version of Service Pack 1 for Microsoft SharePoint Foundation 2013 installed on the computer.