Embed PDF Viewer < 2.4.0 - Authenticated (Editor+) Stored Cross-Site Scripting

Description

The Embed PDF Viewer plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.3.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.