Compact WP Audio Player < 1.9.8 - 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

Exploit: [sc_embed_player fileurl=‘test.mp3’ volume='20" onmouseover=“alert(1)” '] Note: The shortcode makes a play and a pause button, and only the pause button is XSS vulnerable.