First of all: are you really using Lightroom CC, not Lightroom Classic CC?
You do not say which OS you use, but assuming you use Lightroom CC, I think this is the same on both Mac and Windows. In your Pictures folder you should see 'Lightroom Library.lrlibrary'. That is the temporary cache and maybe that is what got corrupted. Move it out of that folder and then start Lightroom CC. You may be asked to login, as if you used Lightroom CC for the first time, but then your images should automatically be downloaded into the new library that Lightroom just created.