CVE-2026-63223

Summary

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

Severity

critical

CVSS

9.8

EPSS

0.8% (p56)

CWE

CWE-434

Also known as

GHSA-mmj4-63m4-r6h5

Published

2026-08-07

Updated

2026-08-07

Advisory details

Impact

This is an unsafe file upload validation vulnerability that can lead to remote code execution in vulnerable application configurations.

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
• place uploads in a web-accessible directory where PHP files can execute

Patches

Upgrade to v4.7.4 or later.

Workarounds

• Save uploads outside the public web root, preferably under writable/uploads.
• Use $file->store() or $file->move($path, $file->getRandomName()) instead of preserving the original client filename.
• Disable script execution in any public upload directory.
• Manually verify the client filename extension before moving the file.
• For image uploads, reject files when $file->getClientExtension() is not an allowed image extension.
• For exact MIME-type validation, reject files when $file->getClientExtension() does not match $file->guessExtension().

References

• https://github.com/advisories/GHSA-mmj4-63m4-r6h5
• https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-mmj4-63m4-r6h5
• https://nvd.nist.gov/vuln/detail/CVE-2026-63223
• https://github.com/codeigniter4/CodeIgniter4/commit/b6e9a4fa1dca2df3d3f261bdf61532df8c6420aa
• https://github.com/codeigniter4/CodeIgniter4/releases/tag/v4.7.4

Related advisories

• CVE-2026-63221 — critical · Packagist/codeigniter4/framework
• CVE-2026-48062 — critical · Packagist/codeigniter4/framework
• CVE-2025-54418 — critical · Packagist/codeigniter4/framework
• CVE-2026-63222 — high · Packagist/codeigniter4/framework
• CVE-2026-63220 — medium · Packagist/codeigniter4/framework
• CVE-2025-24013 — medium · Packagist/codeigniter4/framework
• GHSA-v2f8-6655-7grj — critical · PyPI/vibe-trading-ai
• CVE-2026-45140 — critical · Packagist/chamilo/chamilo-lms

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