wpForo + wpForo Advanced Attachments <= 3.1.3 - Unauthenticated Stored Cross-Site Scripting

The wpForo + wpForo Advanced Attachments plugin for WordPress is vulnerable to Stored Cross-Site Scripting via media upload names in all versions up to, and including, 3.1.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Custom-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.