Input validation vulnerability in PostX – Gutenberg Post Grid Blocks 2.9.9

The PostX – Gutenberg Blocks for Post Grid plugin for WordPress is vulnerable to a security issue that affects how it handles user input. In versions up to and including 2.9.9, the plugin does not properly check user input for malicious content. As a result, attackers are able to inject their own web scripts into pages that are then executed by any user who visits the page. This is known as Cross-Site Scripting.