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.

The Easy PayPal Gift Certificate plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.2.3. This is due to missing or incorrect nonce validation on the 'wpppgc_plugin_options' function. This makes it possible for unauthenticated attackers to update the plugin's settings and inject malicious JavaScript via a forged request, granted they can trick a site administrator into performing an action such as clicking on a link.

The Easy PayPal Events plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.2.1. This is due to missing or incorrect nonce validation on the wpeevent_plugin_buttons() function. This makes it possible for unauthenticated attackers to delete arbitrary posts via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Scott Paterson Easy PayPal Buy Now Button.This issue affects Easy PayPal Buy Now Button: from n/a through 1.9.

Cross-Site Request Forgery (CSRF) vulnerability in Scott Paterson Easy PayPal & Stripe Buy Now Button.This issue affects Easy PayPal & Stripe Buy Now Button: from n/a through 1.8.1.

The Easy PayPal & Stripe Buy Now Button plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.8.3 and in Contact Form 7 – PayPal & Stripe Add-on all versions up to, and including 2.1. This is due to missing or incorrect nonce validation on the 'wpecpp_stripe_connect_completion' function. This makes it possible for unauthenticated attackers to modify the plugins settings and chance the stripe connection via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Auth. (contributor+) Stored Cross-Site Scripting (XSS) vulnerability in Scott Paterson Easy PayPal Shopping Cart plugin <= 1.1.10 versions.

The Easy Accept Payments for PayPal WordPress plugin before 4.9.10 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.

The Easy PayPal Buy Now Button WordPress plugin before 1.7.4 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks