CVE-2026-54177 Laravel Backpack CRUD: HasUploadFields keeps the attacker-supplied file extension — public-disk uploads of `shell.php` reach the webserver
An authenticated administrator can achieve remote code execution by uploading executable files if application-level validation is missing and public disk access is enabled.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-54177?
CVE-2026-54177 is a medium-severity vulnerability in Laravel-Backpack CRUD, published on 14 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
backpack/crud provides Create, Read, Update & Delete (CRUD) functions for Backpack, a collection of Laravel packages that help users build custom administration panels. From 6.0.0 until 6.8.14 and 7.0.38, HasUploadFields methods uploadFileToDisk and uploadMultipleFilesToDisk, used through CrudTrait, and the withFiles() path through FileNameGenerator do not internally reject server-executable file types. An authenticated administrator can achieve remote code execution by using an upload-enabled CRUD field without mimes: and mimetypes: validation when the public disk is web-accessible through php artisan storage:link and the web-server and PHP-FPM configuration executes the stored extension. The legacy path preserves an accepted extension and the newer path derives an extension without blocking dangerous types. The package-level restriction is defense in depth and does not replace application-level upload validation. This issue is fixed in versions 6.8.14 and 7.0.38.
Weakness: CWE-434
Which versions are affected by CVE-2026-54177?
4 open source packages ship an affected version, including backpack/crud.
| Package | Affected | Fixed in |
|---|---|---|
backpack/crud Packagist | From 6.0.0 | 6.8.14 |
backpack/crud Packagist | From 6.0.0 | 6.8.14 |
backpack/crud Packagist | From 7.0.0 | 7.0.38 |
backpack/crud Packagist | From 7.0.0 | 7.0.38 |
How do I fix CVE-2026-54177?
Upgrade backpack/crud to a fixed version for your release line: 6.8.14 or 7.0.38.
Is CVE-2026-54177 being exploited?
There is no known exploitation of CVE-2026-54177 in the wild and no public exploit code.
Sources
Also known as GHSA-8q2w-pv9p-mjvc.