The Memberful plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.73.9 via the WordPress core search feature. This makes it possible for unauthenticated attackers to extract sensitive data from posts that have been restricted to higher-level roles such as site members.

The Memberful – Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'memberful_buy_subscription_link' and 'memberful_podcasts_link' shortcodes in all versions up to, and including, 1.73.7 due to insufficient input sanitization and output escaping on user supplied attributes. 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.