CVE-2021-4425: Wpmudev Defender Security

Medium severity, CVSS 4.3. EPSS: 0.6% chance of exploitation in the next 30 days.

The Defender Security plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.4.6. This is due to missing or incorrect nonce validation on the verify_otp_login_time() function. This makes it possible for unauthenticated attackers to verify a one time login via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Affected products

• Wpmudev Defender Security: up to and including 2.4.6

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