Smart SEO Tool < 3.0.6 - Reflected Cross-Site Scripting

The plugin does not sanitise and escape the search parameter before outputting it back in an attribute when the TDK optimisation setting is enabled, leading to a Reflected Cross-Site Scripting

With the "TDK optimization" setting enabled (7th page, first one): https://example.com/?s=123456"><sCrIpT>alert(/XSS/)</ScRiPt>