Seriously Simple Podcasting < 2.19.1 - Contributor+ Stored XSS

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

1. Create a Podcast episode. 2. Insert the following shortcode in a page/post: [podcast_playlist style=‘" onmouseover=“alert(1)”’] 3. Hover over the player, and the alert triggers successfully.