Vulnerability 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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/codeigniter4/CodeIgniter4/commit/b6e9a4fa1dca2df3d3f261bdf615
- https://github.com/codeigniter4/CodeIgniter4/releases/tag/v4.7.4
- https://github.com/codeigniter4/CodeIgniter4/security/advisories/GHSA-mmj4-63m4-
FAQ
What is CVE-2026-63223?
CVE-2026-63223 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 attacke...
How severe is CVE-2026-63223?
CVE-2026-63223 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-63223?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.