GHSA-393C-P46R-7C95

Vulnerability from github – Published: 2026-04-04 06:06 – Updated: 2026-04-09 19:05
VLAI
Summary
Directus: Path Traversal and Broken Access Control in File Management API
Details

Summary

A broken access control vulnerability was identified in the Directus file management API that allows authenticated users to overwrite files belonging to other users by manipulating the filename_disk parameter.

Details

The PATCH /files/{id} endpoint accepts a user-controlled filename_disk parameter. By setting this value to match the storage path of another user's file, an attacker can overwrite that file's content while manipulating metadata fields such as uploaded_by to obscure the tampering.

Impact

  • Unauthorized File Overwrite: Attackers can replace legitimate files with malicious content, creating significant risk of malware propagation and data corruption.
  • Remote Code Execution: If the storage backend is shared with the extensions location, attackers can deploy malicious extensions that execute arbitrary code when loaded.
  • Data Integrity Compromise: Files can be tampered with or replaced without visible indication in the application interface.

Mitigation

The filename_disk parameter should be treated as a server-controlled value. Uniqueness of storage paths must be enforced server-side, and filename_disk should be excluded from the fields users are permitted to update directly.

Severity
8.5 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "directus"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11.17.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-39942"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284",
      "CWE-639",
      "CWE-915"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-04T06:06:39Z",
    "nvd_published_at": "2026-04-09T17:16:29Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nA broken access control vulnerability was identified in the Directus file management API that allows authenticated users to overwrite files belonging to other users by manipulating the `filename_disk` parameter.\n\n## Details\n\nThe `PATCH /files/{id}` endpoint accepts a user-controlled `filename_disk` parameter. By setting this value to match the storage path of another user\u0027s file, an attacker can overwrite that file\u0027s content while manipulating metadata fields such as `uploaded_by` to obscure the tampering.\n\n## Impact\n\n- **Unauthorized File Overwrite**: Attackers can replace legitimate files with malicious content, creating significant risk of malware propagation and data corruption.\n- **Remote Code Execution**: If the storage backend is shared with the extensions location, attackers can deploy malicious extensions that execute arbitrary code when loaded.\n- **Data Integrity Compromise**: Files can be tampered with or replaced without visible indication in the application interface.\n\n## Mitigation\n\nThe `filename_disk` parameter should be treated as a server-controlled value. Uniqueness of storage paths must be enforced server-side, and `filename_disk` should be excluded from the fields users are permitted to update directly.",
  "id": "GHSA-393c-p46r-7c95",
  "modified": "2026-04-09T19:05:27Z",
  "published": "2026-04-04T06:06:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/directus/directus/security/advisories/GHSA-393c-p46r-7c95"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39942"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/directus/directus"
    },
    {
      "type": "WEB",
      "url": "https://github.com/directus/directus/releases/tag/v11.17.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Directus: Path Traversal and Broken Access Control in File Management API"
}



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