EDD Download Info <= 1.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

The EDD Download Info plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'edd_download_info_link' shortcode in all versions up to, and including, 1.1 due to insufficient input sanitization and output escaping on user supplied attributes. 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.