CVE-2026-63223

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

Published Jul 31, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
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

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-mmj4-63m4-r6h5 CodeIgniter: Uploaded file extension validation bypass in `is_image` and `mime_in` rules
History
Type Values Removed Values Added
First Time appeared Codeigniter
Codeigniter codeigniter
Vendors & Products Codeigniter
Codeigniter codeigniter
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title CodeIgniter: Uploaded file extension validation bypass in is_image and mime_in rules
Weaknesses CWE-434
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 31, 2026, 11:16 PM
Reserved
Jul 15, 2026, 10:19 PM
Status
Deferred
Published
Jul 31, 2026, 6:16 AM
Modified
Sep 8, 2026, 8:51 PM