The WordPress Simple Shopping Cart plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'wp_cart_button' and 'wp_cart_display_product' shortcodes in all versions up to, and including, 5.0.7 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.

The WordPress Simple Shopping Cart plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the automatic redirect URL setting in all versions up to and including 4.7.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

The WP Simple Shopping Cart plugin for WordPress is vulnerable to Sensitive Information Exposure in versions up to, and including, 4.6.3 due to the plugin saving shopping cart data exports in a publicly accessible location (/wp-content/plugins/wordpress-simple-paypal-shopping-cart/includes/admin/). This makes it possible for unauthenticated attackers to view information that should be limited to administrators only and can include data like first name, last name, email, address, IP Address, and more.

The WordPress Simple Shopping Cart WordPress plugin before 4.6.2 does not validate and escape some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks which could be used against high privilege users such as admins.

Cross-site request forgery (CSRF) vulnerability in WordPress Ultra Simple Paypal Shopping Cart v4.4 and earlier allows remote attackers to hijack the authentication of administrators via unspecified vectors.

Cross-site request forgery (CSRF) vulnerability in the WordPress Simple Paypal Shopping Cart plugin before 3.6 for WordPress allows remote attackers to hijack the authentication of administrators for requests that change plugin settings.