CodeIgniter: Uploaded file extension validation bypass in `is_image` and `mime_in` rules
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_imageormime_inwithout an independent safe extension check, such asext_inon 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().
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | codeigniter4/framework | < 4.7.4 | 4.7.4 |
Referencias
- 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
- https://github.com/codeigniter4/CodeIgniter4/releases/tag/v4.7.4
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-434- Plataforma
- Composer
- Paquete
codeigniter4/framework- Publicada
- 07.08.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-mmj4-63m4-r6h5 - CC BY 4.0
Historial de vulnerabilidades: codeigniter4/framework
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 19
- Primera → última
- 01.2022 08.2026
- Sin corrección
- 1
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 6
- Alta 8
- Media 4
- Baja 1
Divulgaciones por año
- 2022: 9
- 2023: 2
- 2024: 1
- 2025: 2
- 2026: 5
-
CodeIgniter: Uploaded file extension validation bypass in `is_image` and `mime_in` rules esta entrada
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