The SEO Smart Links WordPress plugin through 3.0.1 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)
https://wpscan.com/vulnerability/3505481d-141a-4516-bdbb-d4dad4e1eb01