MSSQL user can see all databases
Disalow "VIEW ANY DATABASE" by default.
3
votes

This is default MSSQL behaviour. This issue should be addressed to Microsoft as the provider of SQL Server.
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IG
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The issue exists due to a specific MSSQL behavior. It cannot be fixed by Plesk, but will need to be fixed by Microsoft in their operating system/MSSQL structure.
-- PD(Edited by admin) -
Plesk Tech Support commented
Due to the "VIEW ANY DATABASE" permission, a user can see all the databases hosted in the server, even if they're not related to him.