CVE-2026-53656: VOXEL51 Fiftyone

Medium severity, CVSS 6.3. EPSS: 0.1% chance of exploitation in the next 30 days.

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: before 1.16.1 (fixed in 1.16.1)

Published 2026-08-21. Last modified 2026-09-30.