{"id":"CVE-2026-53656","aliases":["GHSA-q78p-hj9h-5466","PYSEC-2026-3465"],"url":"https://o3.security/vulnerability/CVE-2026-53656","summary":"FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data","details":"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.","published":"2026-08-21T20:34:55.783Z","modified":"2026-08-23T04:00:46.590311779Z","cvss":{"score":6.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N"},"epss":{"score":0.00093,"percentile":0.00584,"asOf":"2026-09-06"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"fiftyone","fixedVersion":"1.17.0"}],"fix":{"url":"https://github.com/voxel51/fiftyone/commit/6c4fa1b27bf53e4ba567742ffd20d033af7b9e64","label":"voxel51/fiftyone@6c4fa1b"},"references":[{"type":"WEB","url":"https://github.com/voxel51/fiftyone/releases/tag/v1.17.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53656.json"},{"type":"ADVISORY","url":"https://github.com/voxel51/fiftyone/security/advisories/GHSA-q78p-hj9h-5466"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53656"},{"type":"FIX","url":"https://github.com/voxel51/fiftyone/commit/6c4fa1b27bf53e4ba567742ffd20d033af7b9e64"},{"type":"FIX","url":"https://github.com/voxel51/fiftyone/commit/7c5b92eec5c7c0210c0c8134351ced77d2800ae0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-23T04:00:46.590311779Z"}}