CVE-2026-63223: CODEIGNITER4

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

CodeIgniter is a PHP full-stack web framework. Prior to 4.7.4, the is_image and mime_in upload validation rules do not independently enforce a safe client filename extension, allowing a remote attacker to upload executable content when an application preserves the client filename and stores uploads in a web-accessible script-enabled directory. Applications are impacted when they validate uploads using is_image or mime_in without an independent safe extension check (such as ext_in on patched versions), save uploaded files using the client-supplied filename, and place uploads in a web-accessible directory where PHP files can execute. This issue is fixed in version 4.7.4.

Affected products

• CODEIGNITER4 CODEIGNITER4: before 4.7.4 (fixed in 4.7.4)

Published 2026-07-31. Last modified 2026-09-08.