Meteor Slides <= 1.5.7 - Authenticated (Contributor+) Stored Cross-Site Scripting

The Meteor Slides plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'slide_url_value' parameter in all versions up to, and including, 1.5.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.