Summary
Microsoft Exchange Server 2019 doesn't install the latest JQuery library. Instead, the program installs an outdated JQuery library.
Resolution
To fix this issue, install the following cumulative update:
Cumulative Update 14 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019
Note
In Exchange Server 2019 CU14, jQuery is upgraded to version 3.6.4. Additionally, the jQuery UI is upgraded to version 1.13.2.