The Companion Sitemap Generator WordPress plugin through 4.5.1.1 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/545c9e2f-bacd-4f30-ae01-de1583e26d32