GHSA-QQMV-5P3G-PX89

Vulnerability from github – Published: 2026-04-04 06:11 – Updated: 2026-04-07 14:20
VLAI?
Summary
Directus: TUS Upload Authorization Bypass Allows Arbitrary File Overwrite
Details

Summary

Directus' TUS resumable upload endpoint (/files/tus) allows any authenticated user with basic file upload permissions to overwrite arbitrary existing files by UUID. The TUS controller performs only collection-level authorization checks, verifying the user has some permission on directus_files, but never validates item-level access to the specific file being replaced. As a result, row-level permission rules (e.g., "users can only update their own files") are completely bypassed via the TUS path while being correctly enforced on the standard REST upload path.

Impact

  • Arbitrary file overwrite: Any authenticated user with basic TUS upload permissions can overwrite any file in directus_files by UUID, regardless of row-level permission rules.
  • Permanent data loss: The victim file's original stored bytes are deleted from storage and replaced with attacker-controlled content.
  • Metadata corruption: The victim file's database record is updated with the attacker's filename, type, and size metadata. Privilege escalation potential: If admin-owned files (e.g., application assets, templates) are stored in directus_files, a low-privilege user could replace them with malicious content.

Workaround

Disable TUS uploads by setting TUS_ENABLED=false if resumable uploads are not required.

Credit

This vulnerability was discovered and reported by bugbunny.ai.

Severity ?
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "directus"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11.16.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35412"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-04T06:11:18Z",
    "nvd_published_at": "2026-04-06T22:16:22Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nDirectus\u0027 TUS resumable upload endpoint (`/files/tus`) allows any authenticated user with basic file upload permissions to overwrite arbitrary existing files by UUID. The TUS controller performs only collection-level authorization checks, verifying the user has some permission on `directus_files`, but never validates item-level access to the specific file being replaced. As a result, row-level permission rules (e.g., \"users can only update their own files\") are completely bypassed via the TUS path while being correctly enforced on the standard REST upload path.\n\n## Impact\n\n- **Arbitrary file overwrite:** Any authenticated user with basic TUS upload permissions can overwrite any file in `directus_files` by UUID, regardless of row-level permission rules.\n- **Permanent data loss:** The victim file\u0027s original stored bytes are deleted from storage and replaced with attacker-controlled content.\n- **Metadata corruption:** The victim file\u0027s database record is updated with the attacker\u0027s filename, type, and size metadata.\nPrivilege escalation potential: If admin-owned files (e.g., application assets, templates) are stored in `directus_files`, a low-privilege user could replace them with malicious content.\n\n## Workaround\n\nDisable TUS uploads by setting `TUS_ENABLED=false` if resumable uploads are not required.\n\n## Credit\n\nThis vulnerability was discovered and reported by [bugbunny.ai](https://bugbunny.ai).",
  "id": "GHSA-qqmv-5p3g-px89",
  "modified": "2026-04-07T14:20:12Z",
  "published": "2026-04-04T06:11:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/directus/directus/security/advisories/GHSA-qqmv-5p3g-px89"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35412"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/directus/directus"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Directus: TUS Upload Authorization Bypass Allows Arbitrary File Overwrite"
}


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