[Answer]-Security issues regarding ajax

From the small amount of detail you’ve given it’s hard to make a judgement however if your authentication system is structurally sound and you’re routing the like to a specific entity correctly i.e if it’s on the page then it simply uses the referring url to get the item to like then this could work quite well and at this point if, hypothetically, all of your code is perfect then you shouldn’t have any security flaws that are from this idea so far.

For future reference, try to be alot more specific and especially in these kinds of questions, detail is a firm necessity. It is impossible to say how secure something is before it has been created.