The Tithe.ly Giving Button WordPress plugin through 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/e344c722-c9b3-4527-a50d-50cdf07ebace/