Vulnerability-Lookup

CVE-2026-94619 (GCVE-0-2026-94619)

Vulnerability from cvelistv5 – Published: 2026-11-06 21:32 – Updated: 2026-11-09 13:28

Title

FileGator: Missing authorization in POST /upload allows cross-user read and deletion of temporary files

Summary

FileGator is a multi-user file manager. Prior to 7.15.0, POST /upload in backend/Controllers/UploadController.php uses the request-supplied resumableFilename as an unnamespaced key in shared temporary storage. In a multi-user deployment configured with distinct per-user home directories, a low-privileged user with upload permission can set resumableTotalChunks and resumableTotalSize to zero so the assembly loop writes no data, after which the handler reads a pre-existing temporary file with that name, stores it in the attacker's home directory, and removes it. The same filename path can append data when chunks are supplied, allowing disclosure, modification, or deletion of another user's transient object, including a pending archive or the login rate-limit lockfile, while Tmpfs path sanitization limits the primitive to the temporary directory. This issue is fixed in version 7.15.0.

Severity

5.9 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-11-09 13:27 UTC

CWE

CWE-862 - Missing Authorization

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7814 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/filegator/filegator/security/a…	x_refsource_CONFIRM
https://github.com/filegator/filegator/pull/598	x_refsource_MISC
https://github.com/filegator/filegator/commit/cae…	x_refsource_MISC
https://github.com/filegator/filegator/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
filegator	filegator	Affected: < 7.15.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-94619

Vulnerability from fkie_nvd - Published: 2026-11-06 22:18 - Updated: 2026-11-09 14:17

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/filegator/filegator/commit/cae442a8323fddae7c8cee0924cdbb1aa6eea702
	security-advisories@github.com	https://github.com/filegator/filegator/pull/598
	security-advisories@github.com	https://github.com/filegator/filegator/releases/tag/v7.15.0
	security-advisories@github.com	https://github.com/filegator/filegator/security/advisories/GHSA-44r8-3p76-84mw
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/filegator/filegator/security/advisories/GHSA-44r8-3p76-84mw

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-44R8-3P76-84MW

Vulnerability from github – Published: 2026-11-09 22:20 – Updated: 2026-11-09 22:20

Summary

FileGator: Missing authorization in POST /upload allows cross-user read and deletion of temporary files

Details

Summary

POST /upload uses the request-supplied resumableFilename directly as a key into the shared temporary directory, without the character filter it applies to resumableIdentifier and without namespacing it per user. A valid user holding the upload permission can read any file in that directory into their own home directory, append to it, and delete it.

This reproduces the cross-user batch-archive disclosure of GHSA-f74m-x83r-c4v4 through a different route — it still works with the fix for that advisory (PR #597) applied — and additionally allows deleting the login rate-limit lockfile.

Reported with explicit preconditions and bounded impact, as before: the primitive is confined to the temporary directory, not the whole filesystem.

Details

backend/Controllers/UploadController.php:61 — $file_name = $request->input('resumableFilename', 'file') is not passed through the preg_replace('/[^0-9a-zA-Z_]/', '', ...) that line 66 applies to resumableIdentifier.
Line 88 builds $prefix namespaced by the sanitized username, but $file_name reaches the temporary storage at lines 118, 121 and 125 without that prefix.
Line 115 — if ($chunks_size >= $total_size) is entered whenever resumableTotalSize is 0.
Lines 116-119 — the assembly loop for ($i = 1; $i <= $total_chunks; ++$i) does not execute when resumableTotalChunks is 0, so nothing is written to $file_name.
Line 121 — readStream($file_name) therefore reads the pre-existing temporary file of that exact name.
Line 122 — its contents are stored into the requester's own home directory.
Line 125 — remove($file_name) deletes it.

Path traversal outside the temporary directory is prevented by Tmpfs::sanitizeFilename(), so the primitive is bounded to that directory — but every user's transient objects share it.

PoC

Preconditions: a multi-user deployment with distinct per-user homedirs. The attacker is a valid low-privileged user holding upload (a first-class permission in the admin UI, and present in the shipped users.json.blank admin set).

Victim creates a batch archive via POST /batchdownload; the JSON response returns the archive id.
Attacker sends one POST /upload with resumableFilename=<victim's id>, resumableTotalChunks=0, resumableTotalSize=0, resumableRelativePath=/, and any small valid file part.
Response is {"data":"Stored"}. The victim's archive is now byte-identical in the attacker's home directory, retrievable through the ordinary GET /download. The victim's temporary archive has been deleted.

Verified end to end with a PHPUnit test against current master; the archive contents matched byte for byte. Test file available on request.

Impact

Missing authorization (CWE-862) on temporary storage objects.

Cross-user disclosure of any transient object whose name the attacker can learn or predict. This includes batch archives — so GHSA-f74m-x83r-c4v4's impact remains reachable even with its fix applied — and the plaintext per-file copies that ZipArchiver::addFileFromStorage() writes while an archive is being built (those still use uniqid(), which is timestamp-derived).
Arbitrary delete within the temporary directory. AuthController::login() stores the login rate-limit counter as md5($ip).'.lock' in that same directory (backend/Controllers/AuthController.php:36, checked at line 44, written at line 58). An attacker can compute their own lockfile name and delete it, defeating the lockout.
Arbitrary append: with resumableTotalChunks >= 1, line 118 write($file_name, ..., true) appends attacker-controlled bytes to an arbitrary existing temporary file.

Remediation

Do not use the request-supplied filename as a storage key. Namespace the assembly file per user — for example reuse the existing $prefix — and carry the display filename separately for the storage->store() call.

Note that simply applying the [^0-9a-zA-Z_] filter to resumableFilename would corrupt legitimate uploads (sample.txt becomes sampletxt), because $final['filename'] is what becomes the stored name. The fix needs the namespacing, not just the filter.

Severity

5.9 (Medium)


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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 7.14.4"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "filegator/filegator"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.15.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-94619"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-11-09T22:20:08Z",
    "nvd_published_at": "2026-11-06T22:18:00Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\n`POST /upload` uses the request-supplied `resumableFilename` directly as a key into the shared temporary directory, without the character filter it applies to `resumableIdentifier` and without namespacing it per user. A valid user holding the `upload` permission can read any file in that directory into their own home directory, append to it, and delete it.\n\nThis reproduces the cross-user batch-archive disclosure of GHSA-f74m-x83r-c4v4 through a different route \u2014 it still works with the fix for that advisory (PR #597) applied \u2014 and additionally allows deleting the login rate-limit lockfile.\n\nReported with explicit preconditions and bounded impact, as before: the primitive is confined to the temporary directory, not the whole filesystem.\n\n## Details\n\n- `backend/Controllers/UploadController.php:61` \u2014 `$file_name = $request-\u003einput(\u0027resumableFilename\u0027, \u0027file\u0027)` is **not** passed through the `preg_replace(\u0027/[^0-9a-zA-Z_]/\u0027, \u0027\u0027, ...)` that line 66 applies to `resumableIdentifier`.\n- Line 88 builds `$prefix` namespaced by the sanitized username, but `$file_name` reaches the temporary storage at lines 118, 121 and 125 **without** that prefix.\n- Line 115 \u2014 `if ($chunks_size \u003e= $total_size)` is entered whenever `resumableTotalSize` is `0`.\n- Lines 116-119 \u2014 the assembly loop `for ($i = 1; $i \u003c= $total_chunks; ++$i)` does not execute when `resumableTotalChunks` is `0`, so nothing is written to `$file_name`.\n- Line 121 \u2014 `readStream($file_name)` therefore reads the pre-existing temporary file of that exact name.\n- Line 122 \u2014 its contents are stored into the requester\u0027s own home directory.\n- Line 125 \u2014 `remove($file_name)` deletes it.\n\nPath traversal outside the temporary directory is prevented by `Tmpfs::sanitizeFilename()`, so the primitive is bounded to that directory \u2014 but every user\u0027s transient objects share it.\n\n## PoC\n\nPreconditions: a multi-user deployment with distinct per-user `homedir`s. The attacker is a valid low-privileged user holding `upload` (a first-class permission in the admin UI, and present in the shipped `users.json.blank` admin set).\n\n1. Victim creates a batch archive via `POST /batchdownload`; the JSON response returns the archive id.\n2. Attacker sends **one** `POST /upload` with `resumableFilename=\u003cvictim\u0027s id\u003e`, `resumableTotalChunks=0`, `resumableTotalSize=0`, `resumableRelativePath=/`, and any small valid file part.\n3. Response is `{\"data\":\"Stored\"}`. The victim\u0027s archive is now byte-identical in the attacker\u0027s home directory, retrievable through the ordinary `GET /download`. The victim\u0027s temporary archive has been deleted.\n\nVerified end to end with a PHPUnit test against current `master`; the archive contents matched byte for byte. Test file available on request.\n\n## Impact\n\nMissing authorization (CWE-862) on temporary storage objects.\n\n- **Cross-user disclosure** of any transient object whose name the attacker can learn or predict. This includes batch archives \u2014 so GHSA-f74m-x83r-c4v4\u0027s impact remains reachable even with its fix applied \u2014 and the plaintext per-file copies that `ZipArchiver::addFileFromStorage()` writes while an archive is being built (those still use `uniqid()`, which is timestamp-derived).\n- **Arbitrary delete** within the temporary directory. `AuthController::login()` stores the login rate-limit counter as `md5($ip).\u0027.lock\u0027` in that same directory (`backend/Controllers/AuthController.php:36`, checked at line 44, written at line 58). An attacker can compute their own lockfile name and delete it, defeating the lockout.\n- **Arbitrary append**: with `resumableTotalChunks \u003e= 1`, line 118 `write($file_name, ..., true)` appends attacker-controlled bytes to an arbitrary existing temporary file.\n\n## Remediation\n\nDo not use the request-supplied filename as a storage key. Namespace the assembly file per user \u2014 for example reuse the existing `$prefix` \u2014 and carry the display filename separately for the `storage-\u003estore()` call.\n\nNote that simply applying the `[^0-9a-zA-Z_]` filter to `resumableFilename` would corrupt legitimate uploads (`sample.txt` becomes `sampletxt`), because `$final[\u0027filename\u0027]` is what becomes the stored name. The fix needs the namespacing, not just the filter.",
  "id": "GHSA-44r8-3p76-84mw",
  "modified": "2026-11-09T22:20:09Z",
  "published": "2026-11-09T22:20:08Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/filegator/filegator/security/advisories/GHSA-44r8-3p76-84mw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-94619"
    },
    {
      "type": "WEB",
      "url": "https://github.com/filegator/filegator/pull/598"
    },
    {
      "type": "WEB",
      "url": "https://github.com/filegator/filegator/commit/cae442a8323fddae7c8cee0924cdbb1aa6eea702"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/filegator/filegator"
    },
    {
      "type": "WEB",
      "url": "https://github.com/filegator/filegator/releases/tag/v7.15.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "FileGator: Missing authorization in POST /upload allows cross-user read and deletion of temporary files"
}

Sightings

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Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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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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CVE-2026-94619 (GCVE-0-2026-94619)

FKIE_CVE-2026-94619

GHSA-44R8-3P76-84MW

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