PDF.js Viewer < 2.1.8 - Contributor+ Stored XSS via Shortcode

The plugin 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.

PoC

[pdfjs-viewer viewer_height=‘" onmouseover=“alert(1)”’]