CVE-2024-3559: Custom Field Suite Project Custom Field Suite

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The Custom Field Suite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the 'cfs[post_content]' parameter versions up to, and including, 2.6.7 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• Custom Field Suite Project Custom Field Suite: up to and including 2.6.7

Published 2024-06-12. Last modified 2026-06-17.