CVE-2021-34666: Add Sidebar Project Add Sidebar

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

The Add Sidebar WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the add parameter in the ~/wp_sidebarMenu.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 2.0.0.

Affected products

• Add Sidebar Project Add Sidebar: up to and including 2.0.0

Published 2021-08-16. Last modified 2026-06-17.