CVE-2026-63223criticalCWE-434

CVE-2026-63223: critical vulnerability in CodeIgniter4

CodeIgniter: Uploaded file extension validation bypass in is_image and mime_in rules

Published

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48Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 9.8epss 0.8%
from disclosure to weapon3 days
Published on NVDJul 31
1st PoC+3d
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
codeigniter4 · CodeIgniter4
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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