Simple SEO <= 1.7.91 - Authenticated (Contributor+) Stored Cross-Site Scripting

The Simple SEO plugin for WordPress is vulnerable to attribute-based stored Cross-Site Scripting in versions up to, and including 1.7.91, due to insufficient sanitization or escaping on the SEO social and standard title parameters. This can be exploited by authenticated users with Contributor and above permissions to inject arbitrary web scripts into posts/pages that execute whenever an administrator access the page.