Vulnerability-Lookup

GHSA-8Q2W-PV9P-MJVC

Vulnerability from github – Published: 2026-08-20 18:38 – Updated: 2026-08-20 18:38

Summary

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

Details

Summary

HasUploadFields (used via CrudTrait on Backpack-managed models) and the withFiles() uploader preserve the client-supplied file extension without validation. On installations using a public disk with php artisan storage:link, this allows an authenticated administrator to upload a file with a server-executable extension that the web server will pass to the PHP interpreter - if no MIME or other type of upload validation is present.

Details

The uploadFileToDisk and uploadMultipleFilesToDisk methods hash the filename stem but write the client-supplied extension to disk verbatim — no allowlist, blocklist, or MIME check is applied inside the trait itself.

The newer withFiles() path (via FileNameGenerator) resolves the extension from the file's MIME type rather than the client filename, but also does not block server-executable types.

Applications that follow the Backpack quickstart without adding explicit mimes: or mimetypes: validation rules in their form requests are affected.

Impact

An authenticated administrator with access to an upload-enabled CRUD panel, on a site using the public disk with web-accessible storage and no MIME type validation, can upload a server-executable file and achieve remote code execution.

Conditions required for exploitation:

Authenticated admin access to a Backpack CRUD panel
An upload field with no mimes: / mimetypes: validation rule
The public disk in use (standard pattern for web-visible uploads)
php artisan storage:link in place
A web server + PHP-FPM stack (default on most hosts)

Fix

A denylist for server-executable extensions has been added to both HasUploadFields and FileNameGenerator. Image-typed fields now additionally enforce an allowlist. This is defence-in-depth — it does not replace application-level validation.

Recommended developer action

Review all upload fields and add explicit mimes: or mimetypes: validation in your form requests or field definitions. Refer to the Backpack field documentation for examples.

Reported by Vishal Shukla (@shukla304) via sechub.dev.

Severity

6.6 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "backpack/crud"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.8.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "backpack/crud"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.0.38"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54177"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-20T18:38:34Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\n`HasUploadFields` (used via `CrudTrait` on Backpack-managed models) and the `withFiles()` uploader preserve the client-supplied file extension without validation. On installations using a `public` disk with `php artisan storage:link`, this allows an authenticated administrator to upload a file with a server-executable extension that the web server will pass to the PHP interpreter - if no MIME or other type of upload validation is present.\n\n## Details\n\nThe `uploadFileToDisk` and `uploadMultipleFilesToDisk` methods hash the filename stem but write the client-supplied extension to disk verbatim \u2014 no allowlist, blocklist, or MIME check is applied inside the trait itself.\n\nThe newer `withFiles()` path (via `FileNameGenerator`) resolves the extension from the file\u0027s MIME type rather than the client filename, but also does not block server-executable types.\n\nApplications that follow the Backpack quickstart without adding explicit `mimes:` or `mimetypes:` validation rules in their form requests are affected.\n\n## Impact\n\nAn authenticated administrator with access to an upload-enabled CRUD panel, on a site using the `public` disk with web-accessible storage and no MIME type validation, can upload a server-executable file and achieve remote code execution.\n\n**Conditions required for exploitation:**\n\n- Authenticated admin access to a Backpack CRUD panel\n- An upload field with no `mimes:` / `mimetypes:` validation rule\n- The `public` disk in use (standard pattern for web-visible uploads)\n- `php artisan storage:link` in place\n- A web server + PHP-FPM stack (default on most hosts)\n\n## Fix\n\nA denylist for server-executable extensions has been added to both `HasUploadFields` and `FileNameGenerator`. Image-typed fields now additionally enforce an allowlist. This is defence-in-depth \u2014 it does not replace application-level validation.\n\n## Recommended developer action\n\nReview all upload fields and add explicit `mimes:` or `mimetypes:` validation in your form requests or field definitions. Refer to the [Backpack field documentation](https://backpackforlaravel.com/docs) for examples.\n\n---\n\nReported by Vishal Shukla ([@shukla304](https://github.com/shukla304)) via sechub.dev.",
  "id": "GHSA-8q2w-pv9p-mjvc",
  "modified": "2026-08-20T18:38:34Z",
  "published": "2026-08-20T18:38:34Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Laravel-Backpack/CRUD/security/advisories/GHSA-8q2w-pv9p-mjvc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Laravel-Backpack/CRUD/pull/5993"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Laravel-Backpack/CRUD"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Laravel-Backpack/CRUD/releases/tag/6.8.14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Laravel-Backpack/CRUD/releases/tag/7.0.38"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Laravel Backpack CRUD: HasUploadFields keeps the attacker-supplied file extension \u2014 public-disk uploads of `shell.php` reach the webserver"
}

CVE-2026-54177 (GCVE-0-2026-54177)

Vulnerability from cvelistv5 – Published: 2026-09-14 17:54 – Updated: 2026-09-14 17:54

Title

backpack/crud: HasUploadFields keeps the attacker-supplied file extension — public-disk uploads of `shell.php` reach the webserver

Summary

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.

Severity

6.6 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/Laravel-Backpack/CRUD/security…	x_refsource_CONFIRM
https://github.com/Laravel-Backpack/CRUD/pull/5993	x_refsource_MISC
https://github.com/Laravel-Backpack/CRUD/pull/5994	x_refsource_MISC
https://github.com/Laravel-Backpack/CRUD/commit/5…	x_refsource_MISC
https://github.com/Laravel-Backpack/CRUD/commit/7…	x_refsource_MISC
https://github.com/Laravel-Backpack/CRUD/releases…	x_refsource_MISC
https://github.com/Laravel-Backpack/CRUD/releases…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
Laravel-Backpack	CRUD	Affected: >= 6.0.0, < 6.8.14 Affected: >= 7.0.0, < 7.0.38

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "CRUD",
          "vendor": "Laravel-Backpack",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 6.0.0, \u003c 6.8.14"
            },
            {
              "status": "affected",
              "version": "\u003e= 7.0.0, \u003c 7.0.38"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "backpack/crud provides Create, Read, Update \u0026 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.6,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-434",
              "description": "CWE-434: Unrestricted Upload of File with Dangerous Type",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T17:54:36.615Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Laravel-Backpack/CRUD/security/advisories/GHSA-8q2w-pv9p-mjvc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Laravel-Backpack/CRUD/security/advisories/GHSA-8q2w-pv9p-mjvc"
        },
        {
          "name": "https://github.com/Laravel-Backpack/CRUD/pull/5993",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Laravel-Backpack/CRUD/pull/5993"
        },
        {
          "name": "https://github.com/Laravel-Backpack/CRUD/pull/5994",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Laravel-Backpack/CRUD/pull/5994"
        },
        {
          "name": "https://github.com/Laravel-Backpack/CRUD/commit/5c5de0af242619d0653c7c70c900cd15b1a197c5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Laravel-Backpack/CRUD/commit/5c5de0af242619d0653c7c70c900cd15b1a197c5"
        },
        {
          "name": "https://github.com/Laravel-Backpack/CRUD/commit/76c3a6e50e3fbd6d5f633208da5b04acb8322969",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Laravel-Backpack/CRUD/commit/76c3a6e50e3fbd6d5f633208da5b04acb8322969"
        },
        {
          "name": "https://github.com/Laravel-Backpack/CRUD/releases/tag/6.8.14",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Laravel-Backpack/CRUD/releases/tag/6.8.14"
        },
        {
          "name": "https://github.com/Laravel-Backpack/CRUD/releases/tag/7.0.38",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Laravel-Backpack/CRUD/releases/tag/7.0.38"
        }
      ],
      "source": {
        "advisory": "GHSA-8q2w-pv9p-mjvc",
        "discovery": "UNKNOWN"
      },
      "title": "backpack/crud: HasUploadFields keeps the attacker-supplied file extension \u2014 public-disk uploads of `shell.php` reach the webserver"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-54177",
    "datePublished": "2026-09-14T17:54:36.615Z",
    "dateReserved": "2026-06-11T21:46:52.381Z",
    "dateUpdated": "2026-09-14T17:54:36.615Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-8Q2W-PV9P-MJVC

Summary

Details

Impact

Fix

Recommended developer action

CVE-2026-54177 (GCVE-0-2026-54177)

Tags

Sightings

Nomenclature