FileBrowser Quantum: Unauthenticated Path Traversal in Public Share Delete Allows Arbitrary File Deletion

{
  "id": "e001507e0c0a4c3843defa89328c0326ffba78b09026da795473adc64bda7f68",
  "url": "https://osv.dev/vulnerability/CVE-2026-44542",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "FileBrowser Quantum: Unauthenticated Path Traversal in Public Share Delete Allows Arbitrary File Deletion",
    "summary": "FileBrowser Quantum is a free, self-hosted, web-based file manager. Prior to 1.3.1-stable and 1.3.9-beta, attacker-controlled path input is joined with a trusted base path prior to sanitization, allowing traversal sequences (e.g., ../) to escape the intended shared directory. As a result, an unauthenticated attacker possessing a valid public share hash with delete permissions enabled can delete arbitrary files outside the shared directory within the share owner’s configured storage scope. This affects public/api/resources and public/api/resources/bulk. This vulnerability is fixed in 1.3.1-stable and 1.3.9-beta.",
    "evidence": "osv:CVE-2026-44542",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-44542",
      "aliases": [
        "CVE-2026-44542",
        "GHSA-fwj3-42wh-8673",
        "GO-2026-5383"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/gtsteffaniak/filebrowser",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6bfc3974192e954f71cc5d1cd04baaaec3b76383"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.3.1-stable"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.3.9-beta"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:gtsteffaniak:filebrowser_quantum:*:-:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.3.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.2.1-stable",
            "v1.0.1-stable",
            "v0.7.6-beta",
            "v0.5.2-beta",
            "v0.5.1-beta",
            "v0.5.0-beta",
            "v0.4.2-beta",
            "v0.4.1-beta",
            "v0.4.0-beta",
            "v0.3.7-beta",
            "v0.3.6-beta",
            "v0.3.4"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44542.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.683121202Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44542.json",
        "https://github.com/gtsteffaniak/filebrowser/security/advisories/GHSA-fwj3-42wh-8673",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44542"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44542.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44542",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517109,
  "published_at": "2026-05-14T17:07:30.602+00:00"
}