CVE-2021-4422: Wpexperts Post Smtp

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

The POST SMTP Mailer plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.0.20. This is due to missing or incorrect nonce validation on the handleCsvExport() function. This makes it possible for unauthenticated attackers to trigger a CSV export via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Affected products

• Wpexperts Post Smtp: up to and including 2.0.20

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