The The Simple Link Directory plugin for WordPress is vulnerable to arbitrary shortcode execution in all versions up to, and including, 8.4.0. This is due to the software allowing users to execute an action that does not properly validate a value before running do_shortcode. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes.

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 Simple Link Directory WordPress plugin before 7.7.2 does not validate and escape the post_id parameter before using it in a SQL statement via the qcopd_upvote_action AJAX action (available to unauthenticated and authenticated users), leading to an unauthenticated SQL Injection

An XSS vulnerability in qcopd-shortcode-generator.php in the Simple Link Directory plugin before 7.3.5 for WordPress allows remote attackers to inject arbitrary web script or HTML, because esc_html is not called for the "echo get_the_title()" or "echo $term->name" statement.