The WP-JS plugin for WordPress contains a script called wp-js.php with the function wp_js_admin, that accepts unvalidated user input and echoes it back to the user. This can be used for reflected Cross-Site Scripting in versions up to, and including, 2.0.6.
https://www.wordfence.com/vulnerability-advisories/#CVE-2022-1567
https://plugins.trac.wordpress.org/browser/wp-js/trunk/wp-js.php?rev=100281#L140