For a complete list of updates please take a look at Microsoft Support: https://support.microsoft.com/en-us/topic/released-cumulative-updates-for-microsoft-dynamics-nav-2017-99f042ca-81ed-9fd5-2645-75fa9590dfd1
The CU only contains only minimal improvements. Depending on the localization other objects can be fixed. On platform level the fixes are really minimal:

		
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