Microsoft has released the September 2020 Office security updates with a total of 30 security updates and 5 cumulative updates for 7 different products. The September 2020 updates fix 13 vulnerabilities that could enable remote attackers to execute arbitrary code on vulnerable systems. The attacks could then install malicious programs, view, change, and delete data, as well as create their own rogue Windows admin accounts on the compromised Windows devices. Microsoft also issued security updates for 129 vulnerabilities, 23 rated of them as Critical and 105 as Important. Non-security updates with fixes and improvements were also released yesterday with the Windows 10 KB4571756 & KB4574727 cumulative updates.
Source: https://www.bleepingcomputer.com/news/security/microsoft-office-september-security-updates-fix-critical-rce-bugs/