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installer.php in the Snap Creek Duplicator (WordPress Site Migration & Backup) plugin before 1.2.30 for WordPress has XSS because the values "url_new" (/wp-content/plugins/duplicator/installer/build/view.step4.php) and "logging" (wp-content/plugins/duplicator/installer/build/view.step2.php) are not filtered correctly.
Use CWE-79, Snapcreek vendor hub and Duplicator product page to widen CVE-2017-16815 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2014-9262 for nearby disclosures in the same product family.