Multiple vulnerabilities were found in Microsoft Office Malicious users can exploit these vulnerabilities to execute arbitrary code, obtain sensitive information, spoof user interface.

Below is a complete list of vulnerabilities:

1. A remote code execution vulnerability in Microsoft Excel can be exploited remotely via specially designed document to execute arbitrary code.
2. An information disclosure vulnerability in Microsoft Exchange can be exploited remotely to obtain sensitive information.
3. A spoofing vulnerability in Microsoft Office can be exploited remotely to spoof user interface.
4. An information disclosure vulnerability in Microsoft Excel can be exploited remotely to obtain sensitive information.
5. A cross-site-scripting (XSS) vulnerability Microsoft Office SharePoint can be exploited remotely via specially crafted web request to spoof user interface

Microsoft Office 2016 for Mac
Microsoft Excel 2010 Service Pack 2 (64-bit editions)
Microsoft Office 2019 for Mac
Microsoft Excel 2016 (32-bit edition)
Office 365 ProPlus for 64-bit Systems
Office 365 ProPlus for 32-bit Systems
Microsoft Excel 2013 Service Pack 1 (32-bit editions)
Microsoft Excel 2010 Service Pack 2 (32-bit editions)
Microsoft Office 2019 for 64-bit editions
Microsoft Excel 2016 (64-bit edition)
Microsoft Excel 2013 RT Service Pack 1
Microsoft Excel 2013 Service Pack 1 (64-bit editions)
Microsoft Office 2019 for 32-bit editions
Microsoft Outlook 2016 (32-bit edition)
Microsoft Office 2016 (64-bit edition)
Skype for Business 2016 (32-bit)
Microsoft Office 2016 (32-bit edition)
Skype for Business 2016 Basic (64-bit)
Microsoft Exchange Server 2019 Cumulative Update 2
Microsoft Lync 2013 Service Pack 1 (32-bit)
Mail and Calendar
Skype for Business 2016 Basic (32-bit)
Microsoft Office 2013 Service Pack 1 (32-bit editions)
Outlook for iOS
Microsoft Exchange Server 2013 Cumulative Update 23
Skype for Business 2016 (64-bit)
Microsoft Outlook 2013 Service Pack 1 (32-bit editions)
Microsoft Exchange Server 2016 Cumulative Update 12
Microsoft Outlook for Android
Microsoft Office 2013 Service Pack 1 (64-bit editions)
Microsoft Lync Basic 2013 Service Pack 1 (32-bit)
Microsoft Lync Basic 2013 Service Pack 1 (64-bit)
Microsoft Lync 2013 Service Pack 1 (64-bit)
Microsoft Outlook 2013 Service Pack 1 (64-bit editions)
Microsoft Office 2013 RT Service Pack 1
Microsoft Outlook 2010 Service Pack 2 (64-bit editions)
Microsoft Outlook 2016 (64-bit edition)
Microsoft Exchange Server 2019 Cumulative Update 1
Microsoft Exchange Server 2010 Service Pack 3
Microsoft Exchange Server 2016 Cumulative Update 13
Microsoft Outlook 2010 Service Pack 2 (32-bit editions)
Microsoft Office 2010 Service Pack 2 (64-bit editions)
Microsoft Office 2010 Service Pack 2 (32-bit editions)
Microsoft SharePoint Enterprise Server 2013 Service Pack 1
Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server 2019

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

4507464
4507460
4507457
4507448
4507453
4507469
4507435
4507462
4507449
4507455
4507458
4507450
4464592
4509410
4464558
4475517
4475509
4475514
4509409
4509408
4475545
4475519
4475513
4464572
4464565
4464543
4461539
4462224
4464534
4018375
4475529
4475520
4475522
4475527
4475510