The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

A XSS vulnerability was found in html-page <=2.1.1 that allows malicious Javascript code to be executed in the user's browser due to the absence of sanitization of the paths before rendering.

The html-pages node module contains a path traversal vulnerabilities that allows an attacker to read any file from the server with cURL.