FileBrowser Quantum: Symlink following escapes user scope allowing arbitrary file read outside the served directory

{
  "id": "a53bc31dcac996c0896c38b1165b7fa931ea4c6f12e353da925cb5f5dc38383d",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-116682",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FileBrowser Quantum: Symlink following escapes user scope allowing arbitrary file read outside the served directory",
    "summary": "FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.5.2-stable and 2.0.1-beta, file read handling in backend/pkg/indexing/indexingFiles.go resolves symbolic links through GetRealPath without confirming that the resolved target remains inside the source root and the user's authorized scope. Download, preview, media, OnlyOffice, and public-share read flows that enable FollowSymlinks can therefore serve an out-of-scope target through a reachable in-scope symlink. An authenticated user with download access can read server-accessible files outside the assigned scope, and a holder of a public share link can do the same without an account when the shared directory exposes such a symlink. This issue is fixed in 1.5.2-stable and 2.0.1-beta.",
    "evidence": "cve:CVE-2026-116682",
    "products": [
      {
        "name": {
          "value": "filebrowser",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-116682",
      "aliases": [
        "CVE-2026-116682"
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "scope": "CHANGED",
            "version": "3.1",
            "baseScore": 8.6,
            "attackVector": "NETWORK",
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
            "integrityImpact": "NONE",
            "userInteraction": "NONE",
            "attackComplexity": "LOW",
            "availabilityImpact": "NONE",
            "privilegesRequired": "NONE",
            "confidentialityImpact": "HIGH"
          }
        }
      ],
      "affected": [
        {
          "vendor": "gtsteffaniak",
          "product": "filebrowser",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.5.2-stable"
            },
            {
              "status": "affected",
              "version": ">= 2.0.0-beta, < 2.0.1-beta"
            }
          ]
        }
      ],
      "modified": "2026-10-27T17:48:04.364Z",
      "provider": "cve",
      "references": [
        "https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-mgqf-5mf5-prfj",
        "https://github.com/gtsteffaniak/filebrowser/pull/2795",
        "https://github.com/gtsteffaniak/filebrowser/pull/2800",
        "https://github.com/gtsteffaniak/filebrowser/commit/3c8c02414eefd3351ffe437fa39ff6eb150ffa67",
        "https://github.com/gtsteffaniak/filebrowser/commit/4126edeb07a015c3809a89249b283e07a4e50c38",
        "https://github.com/gtsteffaniak/filebrowser/releases/tag/v1.5.2-stable",
        "https://github.com/gtsteffaniak/filebrowser/releases/tag/v2.0.1-beta"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
          "shortName": "GitHub_M",
          "dateUpdated": "2026-10-27T17:48:04.364Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-116682",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/containers/cna/metrics"
  },
  "source_id": "core-cve",
  "document_id": 398021,
  "published_at": "2026-10-27T17:48:04.364+00:00"
}