Microsoft released the August 2019 Microsoft Office security updates, bundling a total of 20 security updates and 4 cumulative updates across seven different products. Users are strongly advised to install these updates as soon as possible. 15 of the 20 updates patch remote code execution vulnerabilities, 15 of them are rated as critical by Microsoft. Three more security updates are designed to fix cross-site-scripting (XSS) vulnerabilities affecting SharePoint Server 2019, SharePoint Enterprise Server 2016, and SharePoint 2010 software products.
Source: https://www.bleepingcomputer.com/news/security/microsoft-releases-the-august-2019-security-updates-for-office/