The Embed PDF WordPress plugin through 1.0.6 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks
https://wpscan.com/vulnerability/2a162365-5a86-423d-b7c4-55c9b4d8b024