backpack/crud security advisory

CVE-2026-54177: Laravel Backpack CRUD: HasUploadFields keeps the attacker-supplied file extension — public-disk uploads of shell.php reach the webserver

CVE-2026-54177 is a medium-severity remote code execution vulnerability in the PHP package backpack/crud (CVSS 6.6), published 14 September 2026. It is fixed in 6.8.14 and 7.0.38, one per release line; earlier versions on each line are affected. Exploiting it needs an admin-level account.

medium 6.6 published 2026-09-14 · updated 2026-09-30

Affected versions: >= 6.0.0, < 6.8.14
>= 7.0.0, < 7.0.38
Fixed in: 6.8.14, 7.0.38
Newest release: 7.1.24
Severity: Medium · CVSS 6.6
Type: Remote code execution
CWE-434
Exploited in the wild: Not on the CISA KEV list
checked 2026-11-04

Is your backpack/crud version affected?

Run composer show backpack/crud in your project, then enter the version. We check it against this and every other known backpack/crud advisory.

Who can exploit CVE-2026-54177

Access: A high-privilege account in the app, such as an admin.
Conditions: It only works under specific conditions the attacker does not fully control (CVSS rates the attack as high complexity).

CVSS vector (scored by GitHub): CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Your app is only exposed if it uses the affected part of backpack/crud. The advisory below says which part that is. If you are not sure, upgrade anyway: it costs less than finding out.

How to fix CVE-2026-54177 in backpack/crud

Find the installed version: composer show backpack/crud. If you never required it yourself, composer why backpack/crud shows which package pulls it in.
Update it: composer update backpack/crud --with-all-dependencies. You need the fixed version for your release line (6.8.14 and 7.0.38).
If Composer will not go that high, your composer.json constraint is holding it back. Widen it (for example "backpack/crud": "^7.0.38" if you can take that version), or upgrade the package that requires it.
Run composer audit. It reads the same advisory data and should no longer list CVE-2026-54177.
Commit composer.lock and deploy it. On the server, run composer install --no-dev from the lock file, not composer update.

If you cannot upgrade yet

General hardening for remote code execution issues while the upgrade waits. None of it replaces the fix.

Never pass user-controlled data to unserialize() or to template rendering, and restrict who can edit templates or settings.
Put a web application firewall in front of the app and watch for new PHP files or admin users.
If your app does not use the affected feature, note that in your audit, but still plan the upgrade.

The CVE-2026-54177 advisory

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.

Description from the CVE record, published by GitHub (the CVE Numbering Authority), via the NVD entry for CVE-2026-54177. Advisory title: “Laravel Backpack CRUD: HasUploadFields keeps the attacker-supplied file extension — public-disk uploads of shell.php reach the webserver”.

References

GitHub advisory GHSA-8q2w-pv9p-mjvc github.com
Fix commit 5c5de0a github.com
Fix commit 76c3a6e github.com
Pull request #5993 github.com
Pull request #5994 github.com
Release 6.8.14 github.com
Release 7.0.38 github.com

Other backpack/crud advisories

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Where this data comes from

Affected and fixed versions: the Packagist security advisories API (GitHub Advisory Database and FriendsOfPHP), the same data composer audit uses. Synced 2026-11-03.
Description, score, weakness and references: NIST National Vulnerability Database (NVD), checked 2026-11-04. This product uses data from the NVD API but is not endorsed or certified by the NVD.
Exploited-in-the-wild status: the CISA Known Exploited Vulnerabilities catalog, checked 2026-11-04.
Compiled by Daniel Lasek at Laskyr from the sources above. The summary, “who can exploit it”, “how to fix it” and hardening sections are our plain-English reading of the record and are generated from it. The quoted description is the record's own text. Spot an error? Tell us.