Featured Image from URL (FIFU) < 4.6.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via fifu_input_url

Description

The Featured Image from URL (FIFU) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the fifu_input_url parameter in all versions up to, and including, 4.6.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor access or higher, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.