The WP Meta SEO WordPress plugin before 4.5.5 does not validate image file paths before attempting to manipulate the image files, leading to a PHAR deserialization vulnerability. Furthermore, the plugin contains a gadget chain which may be used in certain configurations to achieve remote code execution.

The WP Meta SEO WordPress plugin before 4.5.3 does not properly sanitize and escape inputs into SQL queries, leading to a blind SQL Injection vulnerability that can be exploited by subscriber+ users.

The WP Meta SEO WordPress plugin before 4.5.3 does not authorize several ajax actions, allowing low-privilege users to make updates to certain data and leading to an arbitrary redirect vulnerability.

The WP Meta SEO WordPress plugin before 4.4.7 does not sanitise or escape the breadcrumb separator before outputting it to the page, allowing a high privilege user such as an administrator to inject arbitrary javascript into the page even when unfiltered html is disallowed.