WP Blog and Widget < 2.3.1 - Contributor+ Stored XSS via Shortcode

The plugin does not validate and escape some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks which could be used against high privilege users such as admins.

PoC

Note: First, you need to add a Blog Post at http://localhost/wp-admin/edit.php?post_type=blog_post Exploit shortcode: [recent_blog_post grid=‘1" onmouseover=“alert(1)”’]