The GiveWP – Donation Plugin and Fundraising Platform plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'twitter_message' Sequoia Template Setting in all versions up to, and including, 4.16.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with give worker-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected script executes specifically when a donor clicks the Share on Twitter button on the Sequoia donation confirmation view, as that is when the unescaped twitter_message value is evaluated inside the JavaScript template literal.
https://plugins.trac.wordpress.org/changeset?reponame=&old=3607718%40give&new=3607718%40give
https://plugins.trac.wordpress.org/browser/give/tags/4.15.5/includes/formatting.php#L768
https://plugins.trac.wordpress.org/browser/give/tags/4.14.5/includes/formatting.php#L768