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 WP Event Manager – Events Calendar, Registrations, Sell Tickets with WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'events' shortcode in all versions up to, and including, 3.1.43 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 Event Manager – Events Calendar, Registrations, Sell Tickets with WooCommerce plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the plugin parameter in all versions up to, and including, 3.1.41 due to insufficient input sanitization and output escaping. 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.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WP Event Manager WP User Profile Avatar allows Stored XSS.This issue affects WP User Profile Avatar: from n/a through 1.0.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in WP Event Manager WP Event Manager – Events Calendar, Registrations, Sell Tickets with WooCommerce allows Stored XSS.This issue affects WP Event Manager – Events Calendar, Registrations, Sell Tickets with WooCommerce: from n/a through 3.1.40.

Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in WP Event Manager WP Event Manager – Events Calendar, Registrations, Sell Tickets with WooCommerce plugin <= 3.1.39 versions.

The WP Event Manager – Events Calendar, Registrations, Sell Tickets with WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in versions up to, and including, 3.1.37.1 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 Event Manager WordPress plugin before 3.1.28 does not sanitise and escape its search before outputting it back in an attribute on the event dashboard, leading to a Reflected Cross-Site Scripting

The WP Event Manager WordPress plugin before 3.1.23 does not escape some of its Field Editor settings when outputting them, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed