getgrav Grav up to 1.0.2 API Media Controller validateFileExtension filename unrestricted upload

Summaryinfo

A vulnerability labeled as problematic has been found in getgrav Grav up to 1.0.2. The affected element is the function validateFileExtension of the component API Media Controller. The manipulation of the argument filename results in unrestricted upload. This vulnerability is reported as CVE-2026-61457. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic has been found in getgrav Grav up to 1.0.2. Affected is the function validateFileExtension of the component API Media Controller. The manipulation of the argument filename 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:

The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 contains a file upload extension bypass in the API media controller. HandlesMediaUploads::validateFileExtension() inspects only the final file extension via pathinfo($filename, PATHINFO_EXTENSION), so a user with api.media.write permission can upload a file with a double extension such as shell.php.jpg to bypass the dangerous extensions blocklist. The web server may then execute the file as PHP, resulting in remote code execution.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-61457 since 07/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are required for exploitation. 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 1.0.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-44651). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• getgrav

Name

• Grav

Version

• 1.0.0
• 1.0.1
• 1.0.2

Website

• Product: https://github.com/getgrav/grav/

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

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