Microsoft recently announced a security update for vulnerabilities in Exchange Server 2019, 2016, and 2013. The update that was announced on November 9, 2021, came as a security update rollup for some very pressing Exchange Server spoofing and remote code vulnerabilities.
 
Hosting Controller immediately verified the descriptions of the security update and sized it against its latest service pack 10.28. The vulnerabilities were already found resolved in the latest build.
 
To learn more about this security rollup, see https://support.microsoft.com/en-gb/topic/description-of-the-security-update-for-microsoft-exchange-server-2019-2016-and-2013-november-9-2021-kb5007409-7e1f235a-d41b-4a76-bcc4-3db90cd161e7