[Defender] Security Issue

I have some weird activity on my website.

The entry in the audit log (SEE IMAGE) corresponds to a post that was made on my website, without authorization.

From an “”””guest””” user. This is the post: https://www.newsd***les.com/politica/adsense-wordpress-templates-the-right-product-to-increase-profits/

I can’t delete it because when I enter the admin of my website it doesn’t appear (the entry is hidden).