Countdown Timer for WordPress Block Editor Stored Cross-Site Scripting Vulnerability

A stored cross-site scripting vulnerability has been identified in the Countdown Timer for WordPress Block Editor plugin, affecting versions through 1.0.5. The issue arises because the plugin fails to properly validate and escape certain block options before displaying them on pages or posts. This flaw enables users with contributor roles and above to inject malicious scripts that are stored and executed when the content is viewed.

Impact

Exploitation of this vulnerability allows for stored cross-site scripting, where injected scripts are executed in the context of the user viewing the post or page.