CodeIgniter up to 4.7.3 Upload Validation is_image/mime_in unrestricted upload

Summaryinfo

A vulnerability, which was classified as critical, was found in CodeIgniter up to 4.7.3. This affects the function is_image/mime_in of the component Upload Validation. The manipulation results in unrestricted upload. This vulnerability is reported as CVE-2026-63223. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in CodeIgniter up to 4.7.3. Affected is the function is_image/mime_in of the component Upload Validation. The manipulation with an unknown input leads to a unrestricted upload vulnerability. CWE is classifying the issue as CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-63223 since 07/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1608.002 by the MITRE ATT&CK project.

Upgrading to version 4.7.4 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• CodeIgniter

Version

• 4.7.0
• 4.7.1
• 4.7.2
• 4.7.3

License

• open-source

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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