The MoolaMojo WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the classes parameter found in the ~/views/button-generator.html.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 0.7.4.1.
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38358
https://plugins.trac.wordpress.org/browser/moolamojo/trunk/views/button-generator.html.php#L16