If you are using Microsoft SharePoint, it is better to check your system if any vulnerability exists.
When Microsoft SharePoint fails to check source markup, vulnerability occurs. This vulnerability leads to remote code execution attack and attacker can run arbitrary code in the context of the SharePoint application.
Attacker creates a special SharePoint application package to exploit the vulnerability.
Check mechanism of source markup are built with the security update to eliminate vulnerability.
If you have this vulnerability, you can update your system as suggested by Microsoft team.
More information can be find at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-16952