The WP-Members Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's wpmem_loginout shortcode in all versions up to, and including, 3.4.9.5 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.

The WP-Members Membership Plugin plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 3.4.9.5. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

The WP-Members Membership Plugin plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 3.4.8 via the wpmem_field shortcode. This makes it possible for authenticated attackers, with contributor access and above, to extract sensitive data including user emails, password hashes, usernames, and more.

The WP-Members Membership plugin for WordPress is vulnerable to unauthorized plugin settings update due to a missing capability check on the do_field_reorder function in versions up to, and including, 3.4.7.3. This makes it possible for authenticated attackers with subscriber-level access to reorder form elements on login forms.

The wp-members plugin before 3.2.8 for WordPress has CSRF.

Cross-site scripting vulnerability in WP-Members prior to version 3.1.8 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.