{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.63.19"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "328f629181888760f3c8b3ff9f3b5bec50f4e54f"
            },
            {
              "fixed": "fe7efb2e6afe66774cd86a5b0a03033bd514d0c0"
            }
          ],
          "repo": "https://github.com/filebrowser/filebrowser",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-576v-w77m-gr84"
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-178"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72836.json"
  },
  "details": "FileBrowser before 2.63.19 does not account for case-insensitive filesystems when checking home directory ownership during self-registration. When Signup and CreateUserDir are enabled and FileBrowser's root is on a case-insensitive filesystem (confirmed on Windows/NTFS), two self-registered usernames that differ only in letter case (e.g., CaseVictim and casevictim) are stored as distinct accounts but resolve to the same physical home directory, because the scope-ownership check compares the persisted scope as an exact case-sensitive string. A second registrant can therefore read, overwrite, and delete another account's files through authenticated HTTP endpoints, without needing an existing account or victim interaction.",
  "id": "CVE-2026-72836",
  "modified": "2026-08-18T12:58:02.698886077Z",
  "published": "2026-08-14T11:35:41.491Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72836.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72836"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/filebrowser-before-case-sensitivity-authentication-bypass"
    },
    {
      "type": "FIX",
      "url": "https://github.com/filebrowser/filebrowser/commit/fe7efb2e6afe66774cd86a5b0a03033bd514d0c0"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "FileBrowser before 2.63.19 Case Sensitivity Authentication Bypass"
}