The AJAX action, wp_ajax_ninja_forms_sendwp_remote_install_handler, did not have a capability check on it, nor did it have any nonce protection, therefore making it possible for low-level users, such as subscribers, to install and activate the SendWP Ninja Forms Contact Form – The Drag and Drop Form Builder for WordPress WordPress plugin before 3.4.34 and retrieve the client_secret key needed to establish the SendWP connection while also installing the SendWP plugin.

In the Ninja Forms Contact Form WordPress plugin before 3.4.34.1, low-level users, such as subscribers, were able to trigger the action, wp_ajax_nf_oauth, and retrieve the connection url needed to establish a connection. They could also retrieve the client_id for an already established OAuth connection.

The Ninja Forms plugin before 3.4.27.1 for WordPress allows CSRF via services integration.

The Ninja Forms plugin before 3.4.27.1 for WordPress allows attackers to bypass validation via the email field.

The Ninja Forms plugin before 3.4.28 for WordPress lacks escaping for submissions-table fields.

The ninja-forms plugin before 3.4.24.2 for WordPress allows CSRF with resultant XSS.

The Ninja Forms plugin 3.4.22 for WordPress has Multiple Stored XSS vulnerabilities via ninja_forms[recaptcha_site_key], ninja_forms[recaptcha_secret_key], ninja_forms[recaptcha_lang], or ninja_forms[date_format].

The ninja-forms plugin before 3.0.31 for WordPress has insufficient HTML escaping in the builder.

The ninja-forms plugin before 3.3.9 for WordPress has insufficient restrictions on submission-data retrieval during Export Personal Data requests.

The ninja-forms plugin before 3.2.15 for WordPress has parameter tampering.