Video Conferencing with Zoom < 4.0.10 - 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. Insert the following shortcode in a post/page: [zoom_list_meetings author=‘" onmouseover=“alert(1)”’] 2. Hover over the list or the “No Meetings Found” message if there are no elements to show, the alert will trigger successfully.