The plugin does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).
Proof of Concept
1. Go to SEO by 10Web » Sitemap section.
2. And new URL to the page.
3. Add XSS payload: "><audio src=x onerror=confirm("XSS")>
4. Save to trigger the XSS.