The Featured Image from URL (FIFU) plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the fifuinputurl 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.

The Featured Image from URL (FIFU) plugin for WordPress is vulnerable to SQL Injection via the getallurls() function in all versions up to, and including, 5.2.7 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for authenticated attackers, with Administrator-level access and above, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

The Featured Image from URL (FIFU) plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 5.2.7 through publicly exposed log files. This makes it possible for unauthenticated attackers to view potentially sensitive information contained in the exposed log files.

The Featured Image from URL (FIFU) WordPress plugin before 4.0.1 does not have CSRF check in place when updating its settings, which could allow attackers to make a logged in admin change them via a CSRF attack. Furthermore, due to the lack of validation, sanitisation and escaping in some of them, it could also lead to Stored XSS issues

The Featured Image from URL (FIFU) WordPress plugin before 4.0.1 does not validate, sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks when the unfilteredhtml capability is disallowed (for example in multisite setup)