The Makesweat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'makesweat_clubid' setting in all versions up to, and including, 0.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
https://plugins.trac.wordpress.org/browser/makesweat/trunk/makesweat.php#L85
https://plugins.trac.wordpress.org/browser/makesweat/trunk/makesweat.php#L64
https://plugins.trac.wordpress.org/browser/makesweat/tags/0.1/makesweat.php#L85
https://plugins.trac.wordpress.org/browser/makesweat/tags/0.1/makesweat.php#L64