Remote Content Shortcode <= 1.5 - Authenticated (Contributor+) Stored Cross-Site Scripting

The Remote Content Shortcode plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'remote_content' shortcode in all versions up to, and including, 1.5 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.