I want to find the same one, since i was talking to TAC 3months back, they told with SMA 11.X it is possible to get that report.
Support for new features
in AsyncOS 11.5 for Cisco
Web Security Appliances
Reporting support for the following feature which is new in AsyncOS 11.5
for Cisco Web Security Appliances:
• User Count. Use this report to view details about:
– The total number of authenticated and unauthenticated users of
Web Security appliances.
– The unique user count for the last 30 days, 90 days, and 180 days.
Fore more information, see the “Using Centralized Web Reporting and
Hope this information help you.
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If you need to display users in the WSA built in reporting, one of the requirement to show the users is to have authentication enabled in WSA otherwise in the user reporting, it will only shows the incoming IP addresses.
In WSA built in user reporting, WSA can only shows the TOP users transactions, bandwidth used, etc. You can also use Web tracking for Proxy Services and get data for specific users and what traffic that the users are doing or display all users for certain period of time and export that report to PDF/CSV