The Integration of Moneybird for WooCommerce WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the error_description parameter found in the ~/templates/wcmb-admin.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 2.1.1.
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-38349
https://plugins.trac.wordpress.org/browser/woo-moneybird/tags/2.1.1/templates/wcmb-admin.php#L8