# CVE-2026-53656

## Summary

- **CVE ID:** CVE-2026-53656
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N)
- **CWE:** CWE-346, CWE-942
- **Published:** Aug 21, 2026
- **Last Modified:** Aug 21, 2026

## Description

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.

## Affected Products

- voxel51 — fiftyone (< 1.16.1)

## References

- [CNA](https://github.com/voxel51/fiftyone/security/advisories/GHSA-q78p-hj9h-5466)
- [CNA](https://github.com/voxel51/fiftyone/commit/6c4fa1b27bf53e4ba567742ffd20d033af7b9e64)
- [CNA](https://github.com/voxel51/fiftyone/commit/7c5b92eec5c7c0210c0c8134351ced77d2800ae0)
- [CNA](https://github.com/voxel51/fiftyone/releases/tag/v1.17.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.09%
- **EPSS Percentile:** 0.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._