Vulnerability-Lookup

CVE-2026-54096 (GCVE-0-2026-54096)

Vulnerability from cvelistv5 – Published: 2026-06-25 17:35 – Updated: 2026-06-25 18:36

Title

File Browser: Improper Access Control Occurs via Pre-Created Public Share for a Non-existent Path

Summary

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.7, `POST /api/share/<path>` accepts an authenticated request for an arbitrary path and stores a public share record without checking whether the target file currently exists. Later, when a file is created at that same path, the previously created public share immediately becomes valid and exposes the new file through `GET /api/public/dl/<hash>`. This vulnerability is fixed in 2.63.7.

Severity

8.4 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-25 18:35 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root Scorecard

References

1 reference

URL	Tags
https://github.com/filebrowser/filebrowser/securi…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
filebrowser	filebrowser	Affected: < 2.63.7	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-54096

Vulnerability from fkie_nvd - Published: 2026-06-25 19:16 - Updated: 2026-06-25 19:58

Severity

8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/filebrowser/filebrowser/security/advisories/GHSA-3q2p-72cj-682c
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/filebrowser/filebrowser/security/advisories/GHSA-3q2p-72cj-682c

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "filebrowser",
          "vendor": "filebrowser",
          "versions": [
            {
              "status": "affected",
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    }
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GHSA-3Q2P-72CJ-682C

Vulnerability from github – Published: 2026-06-12 21:07 – Updated: 2026-07-21 14:45

Summary

File Browser: Improper Access Control Occurs via Pre-Created Public Share for a Non-existent Path

Details

Summary

This is similar vulnrability of CVE-2026-0035, which was fixed in Android MediaProvider with high severity. In the original Java issue, MediaStore.createWriteRequest() accepted attacker-controlled URIs and created a future grant even when the referenced media item did not exist yet. The Android fix added an existence check before creating the request.

filebrowser/filebrowser has the analogous issue in Go. POST /api/share/<path> accepts an authenticated request for an arbitrary path and stores a public share record without checking whether the target file currently exists. Later, when a file is created at that same path, the previously created public share immediately becomes valid and exposes the new file through GET /api/public/dl/<hash>.

Details

The vulnerable create path is:

http/share.go
sharePostHandler()
route: POST /api/share/<path>

sharePostHandler() only checks that the caller is authenticated and has share/download permissions. It then builds a share.Link directly from r.URL.Path and saves it:

s = &share.Link{
    Path:         r.URL.Path,
    Hash:         str,
    Expire:       expire,
    UserID:       d.user.ID,
    PasswordHash: string(hash),
    Token:        token,
}

if err := d.store.Share.Save(s); err != nil {
    return http.StatusInternalServerError, err
}

There is no Stat, Exists, or equivalent check before the public share record is committed.

The vulnerable consume path is:

http/public.go
withHashFile()
routes: GET /api/public/share/<hash>, GET /api/public/dl/<hash>

Each public request loads the saved share by hash and then resolves link.Path against the owner's current filesystem state:

file, err := files.NewFileInfo(&files.FileOptions{
    Fs:   d.user.Fs,
    Path: link.Path,
    ...
})

This means the share is not bound to an object that existed at creation time. It is bound only to a path string, so a share created for a nonexistent path becomes valid later as soon as that path is populated.

PoC

The PoC below starts from external HTTP input only.

Authenticate to File Browser.
Confirm /future4.txt does not exist.
Create a public share for /future4.txt anyway.
Confirm the public share returns 404.
Upload a file to /future4.txt.
Reuse the same public share URL and read the file content.

Reproduction commands:

TOKEN=$(curl -s -X POST http://127.0.0.1:8091/api/login \
  -H 'Content-Type: application/json' \
  -d '{"username":"admin","password":"Password123!"}')

curl -i -X POST http://127.0.0.1:8091/api/share/future4.txt \
  -H "X-Auth: $TOKEN" \
  -H 'Content-Type: application/json' \
  -d '{}'

curl -i http://127.0.0.1:8091/api/public/dl/JVeEQlLO

curl -i -X POST http://127.0.0.1:8091/api/resources/future4.txt \
  -H "X-Auth: $TOKEN" \
  --data-binary 'fourth-secret'

curl -i http://127.0.0.1:8091/api/public/dl/JVeEQlLO

Impact

An authenticated user can create a public share for a path before the file exists, and that same share later exposes whatever file is created at that path. This can unintentionally publish future sensitive files and bypass the expected invariant that a share grants access only to an existing object reviewed at creation time.

Reference

Original CVE: https://nvd.nist.gov/vuln/detail/CVE-2026-0035

Severity

8.4 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.63.6"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/filebrowser/filebrowser/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.63.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/filebrowser/filebrowser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.11.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54096"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-367",
      "CWE-668",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-12T21:07:55Z",
    "nvd_published_at": "2026-06-25T19:16:41Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nThis is similar vulnrability of **`CVE-2026-0035`**, which was fixed in Android `MediaProvider` with **high** severity. In the original Java issue, `MediaStore.createWriteRequest()` accepted attacker-controlled URIs and created a future grant even when the referenced media item did not exist yet. The Android fix added an existence check before creating the request.\n\n`filebrowser/filebrowser` has the analogous issue in Go. `POST /api/share/\u003cpath\u003e` accepts an authenticated request for an arbitrary path and stores a public share record without checking whether the target file currently exists. Later, when a file is created at that same path, the previously created public share immediately becomes valid and exposes the new file through `GET /api/public/dl/\u003chash\u003e`.\n\n### Details\nThe vulnerable create path is:\n\n- `http/share.go`\n- `sharePostHandler()`\n- route: `POST /api/share/\u003cpath\u003e`\n\n`sharePostHandler()` only checks that the caller is authenticated and has share/download permissions. It then builds a `share.Link` directly from `r.URL.Path` and saves it:\n\n```go\ns = \u0026share.Link{\n    Path:         r.URL.Path,\n    Hash:         str,\n    Expire:       expire,\n    UserID:       d.user.ID,\n    PasswordHash: string(hash),\n    Token:        token,\n}\n\nif err := d.store.Share.Save(s); err != nil {\n    return http.StatusInternalServerError, err\n}\n```\n\nThere is no `Stat`, `Exists`, or equivalent check before the public share record is committed.\n\nThe vulnerable consume path is:\n\n- `http/public.go`\n- `withHashFile()`\n- routes: `GET /api/public/share/\u003chash\u003e`, `GET /api/public/dl/\u003chash\u003e`\n\nEach public request loads the saved share by hash and then resolves `link.Path` against the owner\u0027s current filesystem state:\n\n```go\nfile, err := files.NewFileInfo(\u0026files.FileOptions{\n    Fs:   d.user.Fs,\n    Path: link.Path,\n    ...\n})\n```\n\nThis means the share is not bound to an object that existed at creation time. It is bound only to a path string, so a share created for a nonexistent path becomes valid later as soon as that path is populated.\n\n\n### PoC\nThe PoC below starts from external HTTP input only.\n\n1. Authenticate to File Browser.\n2. Confirm `/future4.txt` does not exist.\n3. Create a public share for `/future4.txt` anyway.\n4. Confirm the public share returns `404`.\n5. Upload a file to `/future4.txt`.\n6. Reuse the same public share URL and read the file content.\n\nReproduction commands:\n\n```bash\nTOKEN=$(curl -s -X POST http://127.0.0.1:8091/api/login \\\n  -H \u0027Content-Type: application/json\u0027 \\\n  -d \u0027{\"username\":\"admin\",\"password\":\"Password123!\"}\u0027)\n\ncurl -i -X POST http://127.0.0.1:8091/api/share/future4.txt \\\n  -H \"X-Auth: $TOKEN\" \\\n  -H \u0027Content-Type: application/json\u0027 \\\n  -d \u0027{}\u0027\n\ncurl -i http://127.0.0.1:8091/api/public/dl/JVeEQlLO\n\ncurl -i -X POST http://127.0.0.1:8091/api/resources/future4.txt \\\n  -H \"X-Auth: $TOKEN\" \\\n  --data-binary \u0027fourth-secret\u0027\n\ncurl -i http://127.0.0.1:8091/api/public/dl/JVeEQlLO\n```\n\n\n### Impact\nAn authenticated user can create a public share for a path before the file exists, and that same share later exposes whatever file is created at that path. This can unintentionally publish future sensitive files and bypass the expected invariant that a share grants access only to an existing object reviewed at creation time.\n\n### Reference\n\nOriginal CVE: https://nvd.nist.gov/vuln/detail/CVE-2026-0035",
  "id": "GHSA-3q2p-72cj-682c",
  "modified": "2026-07-21T14:45:00Z",
  "published": "2026-06-12T21:07:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/filebrowser/filebrowser/security/advisories/GHSA-3q2p-72cj-682c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54096"
    },
    {
      "type": "WEB",
      "url": "https://github.com/filebrowser/filebrowser/commit/166583db632e088e9f0adce30aec43bb9d9019f4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/filebrowser/filebrowser"
    },
    {
      "type": "WEB",
      "url": "https://github.com/filebrowser/filebrowser/releases/tag/v2.63.7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "File Browser: Improper Access Control Occurs via Pre-Created Public Share for a Non-existent Path"
}

Sightings

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-54096 (GCVE-0-2026-54096)

FKIE_CVE-2026-54096

GHSA-3Q2P-72CJ-682C

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