CVE-2021-38321: Custom-Sub-Menus Project Custom-Sub-Menus

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

The Custom Menu Plugin WordPress plugin is vulnerable to Reflected Cross-Site Scripting via the selected_menu parameter found in the ~/custom-menus.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 1.3.3.

Affected products

• Custom-Sub-Menus Project Custom-Sub-Menus: up to and including 1.3.3

Published 2021-09-09. Last modified 2026-06-17.