SQL Server 2012 and guest access to the MSDB database

Hello!
Today we were given a vulnerability scan on one of our SQL Server 2012 systems and it is flagging the following issue:
Guest is not disabled on the msdb database.
I pointed our security team to the following article:
https://support.microsoft.com/en-us/kb/2539091
My question on this:
Other than the three cases outlined, are there other possible implications of disabling guest on the msdb database?  Can you point me to a reference that states one way or the other if guest needs to be disabled on msdb?
I do not like the thought of applying this change blindly and I am afraid of a potential issue caused in some other part of our application that we cannot account for down the road.
Any info would be much appreciated.
Thanks!
-Bill S.

Hello,
Possible issues when SQL logins try to connect to a database.
https://connect.microsoft.com/SQLServer/feedback/details/559791/if-you-disable-guest-user-in-msdb-it-causes-issues-with-a-sql-login-sql-2008
Hope this helps.
Regards,
Alberto Morillo
SQLCoffee.com

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