Iphone X back camera shaking

I think that you OIS or Optical Image Stabilisation is broken you will need to bring your iPhone to repair.

Hey Garetsaet,

We understand you're having issues with your iPhone's camera stability. Are you noticing the issue with a certain app or multiple apps? Has there been any physical or water damage to the iPhone? If not, you may need to reach out directly to Apple to have the iPhone inspected.

Contact Apple for support and service

Have a good day.

You must ask Apple for the quote. :)