Medium, CVSS 6.3PyPIAmendedPublished
FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data
CVE-2026-53656 · GHSA-q78p-hj9h-5466
- Affected
- PyPI fiftyone < 1.17.0
- Fixed in
- 1.17.0· Vendor fix available
- Issue
- 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…
Recommended action: Upgrade to 1.17.0 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.