CVE-2022-23556: Codeigniter

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

CodeIgniter is a PHP full-stack web framework. This vulnerability may allow attackers to spoof their IP address when the server is behind a reverse proxy. This issue has been patched, please upgrade to version 4.2.11 or later, and configure `Config\App::$proxyIPs`. As a workaround, do not use `$request->getIPAddress()`.

Affected products

• Codeigniter Codeigniter: from 4.0.0, before 4.2.11 (fixed in 4.2.11)

Published 2022-12-22. Last modified 2026-06-17.