The Credova_Financial WordPress plugin discloses a site's associated Credova API account username and password in plaintext via an AJAX action whenever a site user goes to checkout on a page that has the Credova Financing option enabled. This affects versions up to, and including, 1.4.8.
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39342
https://plugins.trac.wordpress.org/changeset/2606811/credova-financial/trunk/credova-financial.php