codeigniter4 CodeIgniter up to 4.7.2 File Extension Validator FileRules.php unrestricted upload

Summaryinfo

A vulnerability classified as critical has been found in codeigniter4 CodeIgniter up to 4.7.2. Affected by this vulnerability is an unknown functionality of the file system/Validation/StrictRules/FileRules.php of the component File Extension Validator. The manipulation leads to unrestricted upload. This vulnerability is listed as CVE-2026-48062. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as critical, has been found in codeigniter4 CodeIgniter up to 4.7.2. This issue affects some unknown processing of the file system/Validation/StrictRules/FileRules.php of the component File Extension Validator. The manipulation with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

CodeIgniter is a PHP full-stack web framework. Prior to 4.7.3, the ext_in upload validation rule in system/Validation/StrictRules/FileRules.php checked the MIME-derived guessed extension instead of the client-provided filename extension. As a result, an uploaded file named shell.php containing GIF-like content could pass validation such as uploaded[avatar]|is_image[avatar]|mime_in[avatar,image/gif]|ext_in[avatar,gif] because the detected MIME type maps to gif, even though the uploaded filename extension is php. Applications are impacted if they accept user-controlled uploads, rely on ext_in to validate the uploaded filename extension, save uploaded files using the original client filename with $file->move($path), store uploads in a web-accessible directory, and allow PHP or other executable files to run from that directory. In those conditions, this may lead to arbitrary code execution. This issue is fixed in version 4.7.3.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-48062 since 05/20/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1608.002 for this issue.

By approaching the search of inurl:system/Validation/StrictRules/FileRules.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 4.7.3 eliminates this vulnerability.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• codeigniter4

Name

• CodeIgniter

Version

• 4.7.0
• 4.7.1
• 4.7.2

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion