Vulnerability-Lookup

CVE-2026-53656 (GCVE-0-2026-53656)

Vulnerability from cvelistv5 – Published: 2026-08-21 20:34 – Updated: 2026-08-21 21:42

Title

FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data

Summary

FiftyOne is an open-source platform for refining high-quality datasets and visual AI models. Prior to 1.17.0, the FiftyOne App/API server in fiftyone/server/app.py and the /media route in fiftyone/server/routes/media.py unconditionally return Access-Control-Allow-Origin: *. Because the embedded server is local and unauthenticated, a malicious website visited by the user can read cross-origin responses. The /media endpoint accepts a filesystem path, allowing a drive-by page to read files accessible to the server process and exfiltrate them without additional clicks. The allowed_origins configuration and FIFTYONE_ALLOWED_ORIGINS environment variable now make cross-origin access explicit, while the default policy is same-origin. This issue is fixed in version 1.17.0.

Severity

6.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 20:58 UTC

CWE

CWE-346 - Origin Validation Error
CWE-942 - Permissive Cross-domain Policy with Untrusted Domains

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/voxel51/fiftyone/security/advi…	x_refsource_CONFIRM
https://github.com/voxel51/fiftyone/commit/6c4fa1…	x_refsource_MISC
https://github.com/voxel51/fiftyone/commit/7c5b92…	x_refsource_MISC
https://github.com/voxel51/fiftyone/releases/tag/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
voxel51	fiftyone	Affected: < 1.16.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-53656

Vulnerability from fkie_nvd - Published: 2026-08-21 21:17 - Updated: 2026-08-21 22:16

Severity

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/voxel51/fiftyone/commit/6c4fa1b27bf53e4ba567742ffd20d033af7b9e64
	security-advisories@github.com	https://github.com/voxel51/fiftyone/commit/7c5b92eec5c7c0210c0c8134351ced77d2800ae0
	security-advisories@github.com	https://github.com/voxel51/fiftyone/releases/tag/v1.17.0
	security-advisories@github.com	https://github.com/voxel51/fiftyone/security/advisories/GHSA-q78p-hj9h-5466

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
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      "affectedData": [
        {
          "product": "fiftyone",
          "vendor": "voxel51",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.16.1"
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    }
  ],
  "id": "CVE-2026-53656",
  "lastModified": "2026-08-21T22:16:40.100",
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}

GHSA-Q78P-HJ9H-5466

Vulnerability from github – Published: 2026-07-15 21:57 – Updated: 2026-07-15 21:57

Summary

FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data

Details

Impact

The FiftyOne App/API server (fiftyone/server/app.py) and the /media route (fiftyone/server/routes/media.py) unconditionally set a permissive CORS header (Access-Control-Allow-Origin: *) on their responses. Because the embedded App server runs locally and is unauthenticated, this allows any website a user visits to make cross-origin requests to that user's running FiftyOne server and read the responses.

Combined with the unauthenticated /media endpoint — which serves files from the local filesystem by path — the wildcard CORS policy turns a local-only file read into a remotely exploitable, drive-by data exfiltration vulnerability. A malicious web page can silently issue requests such as http://localhost:5151/media?filepath=/etc/passwd and read arbitrary files accessible to the server process (SSH keys, cloud credentials, .env files, dataset media, etc.), then exfiltrate them to an attacker-controlled endpoint.

The victim only needs to have a FiftyOne server running locally and visit a malicious page — no clicks or other interaction are required. Browsers that have shipped Private Network Access / local-network-access protections (e.g. Chromium 142+) mitigate this for some users, but Safari and Firefox do not yet, so the attack remains viable in common configurations.

Who is impacted: any user running FiftyOne (the open-source, embedded App server) locally while also browsing the web.

Not affected: media stored in cloud buckets, which is served via signed URLs on a separate origin.

Patches

Fixed in FiftyOne 1.17.0. The hard-coded Access-Control-Allow-Origin: * has been removed and the server now responds same-origin only by default, which covers local desktop usage and the supported notebook integrations (each served through a same-origin proxy or iframe).

Cross-origin access is now opt-in via a new allowed_origins config option (environment variable FIFTYONE_ALLOWED_ORIGINS), an explicit comma-separated list of trusted origins, e.g.:

export FIFTYONE_ALLOWED_ORIGINS='https://app.example.com,http://localhost:3000'

The literal value * restores the legacy wildcard behavior for users who explicitly require it and emits a warning.

Users should upgrade to FiftyOne 1.17.0 or later.

Workarounds

In affected versions there is no configuration flag to disable the wildcard CORS header without upgrading. Until you can upgrade:

Do not run the FiftyOne App server while browsing untrusted websites.
Keep the App server bound to localhost (the default) and avoid exposing it on a network interface.
Use a browser that enforces Private Network Access protections.

Resources

OWASP A01:2025 – Broken Access Control: https://owasp.org/Top10/2025/A01_2025-Broken_Access_Control/

Severity

6.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "fiftyone"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.17.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-53656"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-346",
      "CWE-942"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-15T21:57:29Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nThe FiftyOne App/API server (`fiftyone/server/app.py`) and the `/media` route (`fiftyone/server/routes/media.py`) unconditionally set a permissive CORS header (`Access-Control-Allow-Origin: *`) on their responses. Because the embedded App server runs locally and is unauthenticated, this allows **any website a user visits to make cross-origin requests to that user\u0027s running FiftyOne server and read the responses**.\n\nCombined with the unauthenticated `/media` endpoint \u2014 which serves files from the local filesystem by path \u2014 the wildcard CORS policy turns a local-only file read into a **remotely exploitable, drive-by data exfiltration** vulnerability. A malicious web page can silently issue requests such as `http://localhost:5151/media?filepath=/etc/passwd` and read arbitrary files accessible to the server process (SSH keys, cloud credentials, `.env` files, dataset media, etc.), then exfiltrate them to an attacker-controlled endpoint.\n\nThe victim only needs to have a FiftyOne server running locally and visit a malicious page \u2014 no clicks or other interaction are required. Browsers that have shipped Private Network Access / local-network-access protections (e.g. Chromium 142+) mitigate this for some users, but Safari and Firefox do not yet, so the attack remains viable in common configurations.\n\n**Who is impacted:** any user running FiftyOne (the open-source, embedded App server) locally while also browsing the web.\n\n**Not affected:** media stored in cloud buckets, which is served via signed URLs on a separate origin.\n\n### Patches\n\nFixed in **FiftyOne 1.17.0**. The hard-coded `Access-Control-Allow-Origin: *` has been removed and the server now responds **same-origin only by default**, which covers local desktop usage and the supported notebook integrations (each served through a same-origin proxy or iframe).\n\nCross-origin access is now opt-in via a new `allowed_origins` config option (environment variable `FIFTYONE_ALLOWED_ORIGINS`), an explicit comma-separated list of trusted origins, e.g.:\n\n```shell\nexport FIFTYONE_ALLOWED_ORIGINS=\u0027https://app.example.com,http://localhost:3000\u0027\n```\n\nThe literal value `*` restores the legacy wildcard behavior for users who explicitly require it and emits a warning.\n\n**Users should upgrade to FiftyOne 1.17.0 or later.**\n\n### Workarounds\n\nIn affected versions there is no configuration flag to disable the wildcard CORS header without upgrading. Until you can upgrade:\n\n- Do not run the FiftyOne App server while browsing untrusted websites.\n- Keep the App server bound to `localhost` (the default) and avoid exposing it on a network interface.\n- Use a browser that enforces Private Network Access protections.\n\n### Resources\n\n- OWASP A01:2025 \u2013 Broken Access Control: https://owasp.org/Top10/2025/A01_2025-Broken_Access_Control/",
  "id": "GHSA-q78p-hj9h-5466",
  "modified": "2026-07-15T21:57:29Z",
  "published": "2026-07-15T21:57:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/voxel51/fiftyone/security/advisories/GHSA-q78p-hj9h-5466"
    },
    {
      "type": "WEB",
      "url": "https://github.com/voxel51/fiftyone/commit/7c5b92eec5c7c0210c0c8134351ced77d2800ae0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/voxel51/fiftyone"
    },
    {
      "type": "WEB",
      "url": "https://github.com/voxel51/fiftyone/releases/tag/v1.17.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data"
}

PYSEC-2026-3465

Vulnerability from pysec - Published: 2026-07-23 11:41 - Updated: 2026-07-23 14:31

Details

Impact

Who is impacted: any user running FiftyOne (the open-source, embedded App server) locally while also browsing the web.

Not affected: media stored in cloud buckets, which is served via signed URLs on a separate origin.

Patches

Cross-origin access is now opt-in via a new allowed_origins config option (environment variable FIFTYONE_ALLOWED_ORIGINS), an explicit comma-separated list of trusted origins, e.g.:

export FIFTYONE_ALLOWED_ORIGINS='https://app.example.com,http://localhost:3000'

The literal value * restores the legacy wildcard behavior for users who explicitly require it and emits a warning.

Users should upgrade to FiftyOne 1.17.0 or later.

Workarounds

In affected versions there is no configuration flag to disable the wildcard CORS header without upgrading. Until you can upgrade:

Do not run the FiftyOne App server while browsing untrusted websites.
Keep the App server bound to localhost (the default) and avoid exposing it on a network interface.
Use a browser that enforces Private Network Access protections.

Resources

OWASP A01:2025 – Broken Access Control: https://owasp.org/Top10/2025/A01_2025-Broken_Access_Control/

Severity

6.3 (Medium)


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

Impacted products

Name	purl
fiftyone	pkg:pypi/fiftyone

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "fiftyone",
        "purl": "pkg:pypi/fiftyone"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.17.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0",
        "0.1.0.1",
        "0.1.2",
        "0.1.3",
        "0.10.0",
        "0.11.0",
        "0.11.1",
        "0.11.2",
        "0.11.2.1",
        "0.12.0",
        "0.13.0",
        "0.13.1",
        "0.13.2",
        "0.13.3",
        "0.14.0",
        "0.14.1",
        "0.14.2",
        "0.14.3",
        "0.14.4",
        "0.15.0",
        "0.15.0.1",
        "0.15.0.2",
        "0.15.1",
        "0.16.0",
        "0.16.1",
        "0.16.2",
        "0.16.3",
        "0.16.4",
        "0.16.5",
        "0.16.6",
        "0.17.0",
        "0.17.1",
        "0.17.2",
        "0.18.0",
        "0.18.0rc0",
        "0.18.1rc0",
        "0.18.1rc1",
        "0.18.1rc10",
        "0.18.1rc11",
        "0.18.1rc12",
        "0.18.1rc13",
        "0.18.1rc14",
        "0.18.1rc15",
        "0.18.1rc16",
        "0.18.1rc17",
        "0.18.1rc18",
        "0.18.1rc19",
        "0.18.1rc2",
        "0.18.1rc20",
        "0.18.1rc21",
        "0.18.1rc22",
        "0.18.1rc23",
        "0.18.1rc24",
        "0.18.1rc25",
        "0.18.1rc26",
        "0.18.1rc3",
        "0.18.1rc4",
        "0.18.1rc5",
        "0.18.1rc6",
        "0.18.1rc7",
        "0.18.1rc8",
        "0.18.1rc9",
        "0.19.0",
        "0.19.1",
        "0.19.1rc0",
        "0.19.1rc1",
        "0.2.0",
        "0.2.0rc1",
        "0.2.1",
        "0.20.0",
        "0.20.1",
        "0.20.1rc1",
        "0.20.1rc2",
        "0.20.1rc3",
        "0.21.0",
        "0.21.1",
        "0.21.2",
        "0.21.3",
        "0.21.4",
        "0.21.5",
        "0.21.6",
        "0.22.0",
        "0.22.1",
        "0.22.2",
        "0.22.3",
        "0.23.0",
        "0.23.0rc1",
        "0.23.0rc2",
        "0.23.1",
        "0.23.2",
        "0.23.3",
        "0.23.3rc1",
        "0.23.4",
        "0.23.5",
        "0.23.6",
        "0.23.7",
        "0.23.8",
        "0.24.0",
        "0.24.1",
        "0.25.0",
        "0.25.1",
        "0.25.2",
        "0.3.0",
        "0.4.0",
        "0.4.1",
        "0.5.0",
        "0.5.1",
        "0.5.2",
        "0.5.2.1",
        "0.5.3",
        "0.5.3.1",
        "0.5.4",
        "0.5.5",
        "0.5.5.1",
        "0.5.6",
        "0.6.0",
        "0.6.0.1",
        "0.6.1",
        "0.6.1.1",
        "0.6.2",
        "0.6.3",
        "0.6.4",
        "0.6.5",
        "0.6.5.1",
        "0.6.5.2",
        "0.6.6",
        "0.7.0",
        "0.7.0.1",
        "0.7.1",
        "0.7.1.1",
        "0.7.1.2",
        "0.7.1.3",
        "0.7.1.4",
        "0.7.2",
        "0.7.3",
        "0.7.3.1",
        "0.7.3.2",
        "0.7.3.3",
        "0.7.3.4",
        "0.7.4",
        "0.8.0",
        "0.8.0.1",
        "0.9.0",
        "0.9.1",
        "0.9.2",
        "0.9.3",
        "0.9.4",
        "1.0.0",
        "1.0.1",
        "1.0.2",
        "1.1.0",
        "1.10.0",
        "1.11.0",
        "1.11.1",
        "1.12.0",
        "1.13.0",
        "1.13.1",
        "1.13.2",
        "1.13.3",
        "1.13.4",
        "1.13.5",
        "1.14.0",
        "1.14.1",
        "1.14.2",
        "1.15.0",
        "1.16.0",
        "1.2.0",
        "1.3.0",
        "1.3.1",
        "1.3.2",
        "1.4.0",
        "1.4.1",
        "1.5.0",
        "1.5.1",
        "1.5.2",
        "1.6.0",
        "1.7.0",
        "1.7.1",
        "1.7.2",
        "1.8.0",
        "1.8.1",
        "1.9.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-53656",
    "GHSA-q78p-hj9h-5466"
  ],
  "details": "### Impact\n\nThe FiftyOne App/API server (`fiftyone/server/app.py`) and the `/media` route (`fiftyone/server/routes/media.py`) unconditionally set a permissive CORS header (`Access-Control-Allow-Origin: *`) on their responses. Because the embedded App server runs locally and is unauthenticated, this allows **any website a user visits to make cross-origin requests to that user\u0027s running FiftyOne server and read the responses**.\n\nCombined with the unauthenticated `/media` endpoint \u2014 which serves files from the local filesystem by path \u2014 the wildcard CORS policy turns a local-only file read into a **remotely exploitable, drive-by data exfiltration** vulnerability. A malicious web page can silently issue requests such as `http://localhost:5151/media?filepath=/etc/passwd` and read arbitrary files accessible to the server process (SSH keys, cloud credentials, `.env` files, dataset media, etc.), then exfiltrate them to an attacker-controlled endpoint.\n\nThe victim only needs to have a FiftyOne server running locally and visit a malicious page \u2014 no clicks or other interaction are required. Browsers that have shipped Private Network Access / local-network-access protections (e.g. Chromium 142+) mitigate this for some users, but Safari and Firefox do not yet, so the attack remains viable in common configurations.\n\n**Who is impacted:** any user running FiftyOne (the open-source, embedded App server) locally while also browsing the web.\n\n**Not affected:** media stored in cloud buckets, which is served via signed URLs on a separate origin.\n\n### Patches\n\nFixed in **FiftyOne 1.17.0**. The hard-coded `Access-Control-Allow-Origin: *` has been removed and the server now responds **same-origin only by default**, which covers local desktop usage and the supported notebook integrations (each served through a same-origin proxy or iframe).\n\nCross-origin access is now opt-in via a new `allowed_origins` config option (environment variable `FIFTYONE_ALLOWED_ORIGINS`), an explicit comma-separated list of trusted origins, e.g.:\n\n```shell\nexport FIFTYONE_ALLOWED_ORIGINS=\u0027https://app.example.com,http://localhost:3000\u0027\n```\n\nThe literal value `*` restores the legacy wildcard behavior for users who explicitly require it and emits a warning.\n\n**Users should upgrade to FiftyOne 1.17.0 or later.**\n\n### Workarounds\n\nIn affected versions there is no configuration flag to disable the wildcard CORS header without upgrading. Until you can upgrade:\n\n- Do not run the FiftyOne App server while browsing untrusted websites.\n- Keep the App server bound to `localhost` (the default) and avoid exposing it on a network interface.\n- Use a browser that enforces Private Network Access protections.\n\n### Resources\n\n- OWASP A01:2025 \u2013 Broken Access Control: https://owasp.org/Top10/2025/A01_2025-Broken_Access_Control/",
  "id": "PYSEC-2026-3465",
  "modified": "2026-07-23T14:31:07.925629Z",
  "published": "2026-07-23T11:41:45.496676Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/voxel51/fiftyone/security/advisories/GHSA-q78p-hj9h-5466"
    },
    {
      "type": "WEB",
      "url": "https://github.com/voxel51/fiftyone/commit/7c5b92eec5c7c0210c0c8134351ced77d2800ae0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/voxel51/fiftyone"
    },
    {
      "type": "WEB",
      "url": "https://github.com/voxel51/fiftyone/releases/tag/v1.17.0"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/fiftyone"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-q78p-hj9h-5466"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53656"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-53656 (GCVE-0-2026-53656)

FKIE_CVE-2026-53656

GHSA-Q78P-HJ9H-5466

Impact

Patches

Workarounds

Resources

PYSEC-2026-3465

Impact

Patches

Workarounds

Resources

Tags

Sightings

Nomenclature

Related by attack behaviour