CVE-2020-5203: Fatfreeframework Fat-Free Framework

Critical severity, CVSS 9.8. EPSS: 2.1% chance of exploitation in the next 30 days.

In Fat-Free Framework 3.7.1, attackers can achieve arbitrary code execution if developers choose to pass user controlled input (e.g., $_REQUEST, $_GET, or $_POST) to the framework's Clear method.

Affected products

• Fatfreeframework Fat-Free Framework: version 3.7.1 only

Published 2020-03-11. Last modified 2026-06-17.