We are on Kentico 11 and jQuery version 3.2.1
will upgrading Jquery cause any issues?
Assuming you're upgrading the front facing website's jQuery there should have no affect on the Kentico instance. If you're using the Kentico UI referenced jQuery, you'll cause all kinds of problems with how Kentico functions.
If you are not talking about internal jQuery version and global aliases are correctly set, then it should not a be a problem.
Yes, Brenden is right. Just adding a quick reference to documentation as it says do not use Kentico-provided jQuery, use your own at any version you like.
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