This security update resolves a spoofing vulnerability that exists when Office Online does not validate origin in cross-origin communications handlers correctly. To learn more about the vulnerability, see the following security advisories:
- Microsoft Common Vulnerabilities and Exposures CVE-2019-1445
- Microsoft Common Vulnerabilities and Exposures CVE-2019-1446
- Microsoft Common Vulnerabilities and Exposures CVE-2019-1447
Note To apply this security update, you must have the release version of Microsoft Office Online Server installed on the computer.
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: November 12, 2019.
Security update replacement information
This security update replaces previously released security update 4475595.
File hash information
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