Feedburner Optin Form <= 0.2.8 - Authenticated (Contributor+) Stored Cross-Site Scripting
EntreBase Advisory: The Feedburner Optin Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 0.2.8 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.
Read more about this vulnerability: https://www.wordfence.com/threat-intel/vulnerabilities/id/f72cbcd8-13ad-4f19-a72c-2c5472e434f1?source=api-prod