---
id: CVE-2026-63223
title: CodeIgniter is a PHP full-stack web framework
summary: >-
  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 a…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-434
published: '2026-07-31'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T20:51:43.490'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63223'
references:
  - url: >-
      https://github.com/codeigniter4/CodeIgniter4/commit/b6e9a4fa1dca2df3d3f261bdf61532df8c6420aa
    label: security-advisories@github.com
  - url: 'https://github.com/codeigniter4/CodeIgniter4/releases/tag/v4.7.4'
    label: security-advisories@github.com
  - url: >-
      https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-mmj4-63m4-r6h5
    label: security-advisories@github.com
tags:
  - nvd
  - exploit-available
epss: 0.008
epssPercentile: 0.54652
exploits:
  github: 2
  githubRepos:
    - 'https://github.com/imbas007/CVE-2026-63223-POC'
    - 'https://github.com/shinthink/CVE-2026-63223'
  checkedAt: '2026-09-25T08:21:06.812Z'
exploitAvailable: true
ingestedAt: '2026-08-01T23:16:02.115Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.