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File Browser has a Path-Based Access Control Bypass via Multiple Leading Slashes in URL

Type: advisorySources: OSV

File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. Prior to 2.57.1, an authenticated user can bypass the application's "Disallow" file path rules by modifying the request URL. By adding multiple slashes (e.g., //private/) to the path, the authorization check fails to match the rule, while the underlying filesystem resolves the path correctly, granting unauthorized access to restricted files. This vulnerability is fixed in 2.57.1.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-25890
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 18:28 UTC · Revision 1

Source evidence

File Browser has a Path-Based Access Control Bypass via Multiple Leading Slashes in URL

core-osv · Original source

Published 9 Feb 2026, 21:21 UTC

File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. Prior to 2.57.1, an authenticated user can bypass the application's "Disallow" file path rules by modifying the request URL. By adding multiple slashes (e.g., //private/) to the path, the authorization check fails to match the rule, while the underlying filesystem resolves the path correctly, granting unauthorized access to restricted files. This vulnerability is fixed in 2.57.1.

osv:CVE-2026-25890
Complete source record
{
  "id": "2998f3ae3b0cea9a06da1b46df2b3dca5107400174af0f8a99f726e3acb99900",
  "url": "https://osv.dev/vulnerability/CVE-2026-25890",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "File Browser has a Path-Based Access Control Bypass via Multiple Leading Slashes in URL",
    "summary": "File Browser provides a file managing interface within a specified directory and it can be used to upload, delete, preview, rename and edit files. Prior to 2.57.1, an authenticated user can bypass the application's \"Disallow\" file path rules by modifying the request URL. By adding multiple slashes (e.g., //private/) to the path, the authorization check fails to match the rule, while the underlying filesystem resolves the path correctly, granting unauthorized access to restricted files. This vulnerability is fixed in 2.57.1.",
    "evidence": "osv:CVE-2026-25890",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-25890",
      "aliases": [
        "CVE-2026-25890",
        "GHSA-4mh3-h929-w968",
        "GO-2026-4474"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/filebrowser/filebrowser",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "e193d43278e79549950d7f0e69af50a38c77f855"
                },
                {
                  "fixed": "489af403a19057f6b6b4b1dc0e48cbb26a202ef9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.57.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "489af403a19057f6b6b4b1dc0e48cbb26a202ef9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "e193d43278e79549950d7f0e69af50a38c77f855"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.57.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.57.0",
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            "v2.55.0",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25890.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.445290341Z",
      "provider": "osv",
      "references": [
        "https://github.com/filebrowser/filebrowser/releases/tag/v2.57.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25890.json",
        "https://github.com/filebrowser/filebrowser/security/advisories/GHSA-4mh3-h929-w968",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25890",
        "https://github.com/filebrowser/filebrowser/commit/489af403a19057f6b6b4b1dc0e48cbb26a202ef9"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-706",
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2.57.2"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25890.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-25890",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505698,
  "published_at": "2026-02-09T21:21:50.764+00:00"
}