The Slimstat Analytics plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'eeb_mailto' shortcode in versions up to, and including, 2.1.7 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.

The Email Encoder – Protect Email Addresses WordPress plugin before 2.1.2 has an endpoint that requires no authentication and will render a user supplied value in the HTML response without escaping or sanitizing the data.