This security update resolves a Microsoft SharePoint Server spoofing vulnerability and Microsoft SharePoint Server information disclosure vulnerability. To learn more about the vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2021-34519 and Microsoft Common Vulnerabilities and Exposures CVE-2021-34517.
Note: To apply this security update, you must have the release version of Service Pack 1 for Microsoft SharePoint Server 2013 installed on the computer.
Improvements and fixes
This update fixes an issue in which the Site Aggregator Web Part doesn't add a new tab as expected.
How to get and install the update
Method 1: Microsoft Update
This update is available from Microsoft Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.
Method 2: Microsoft Update Catalog
To get the standalone package for this update, go to the Microsoft Update Catalog website.
Method 3: Microsoft Download Center
You can get the standalone update package through the Microsoft Download Center. Follow the installation instructions on the download page to install the update.
Security update deployment information
For deployment information about this update, see Security update deployment information: July 13, 2021 (KB5004480).
Security update replacement information
This security update replaces previously released security update 5001954.
File hash information
Information about protection and security
Protect yourself online: Windows Security support
Learn how we guard against cyber threats: Microsoft Security