CVE-2021-4421: Ashstonestudios Advanced Popups

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The Advanced Popups plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.1.1. This is due to missing or incorrect nonce validation on the metabox_popup_save() function. This makes it possible for unauthenticated attackers to save meta tags via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Affected products

• Ashstonestudios Advanced Popups: up to and including 1.1.1

Published 2023-07-12. Last modified 2026-06-17.