{"id":"CVE-2026-53656","aliases":["EUVD-2026-64145","GHSA-q78p-hj9h-5466","PYSEC-2026-3465"],"status":"published","title":"FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data","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.","severity":{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00119,"percentile":0.01777,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-346","CWE-942"],"published":"2026-07-15T21:57:29Z","modified":"2026-10-28T02:30:59Z","fixes":[{"ecosystem":"PyPI","package":"fiftyone","fixed_in":["1.17.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"fiftyone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17.0"}]}]},{"source":"osv","ecosystem":"PyPI","package":"fiftyone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17.0"}]}],"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"]},{"source":"osv","ecosystem":"PyPI","package":"fiftyone","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.17.0"}]}],"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"]}],"products":[{"vendor":"voxel51","product":"fiftyone"}],"references":[{"url":"https://github.com/voxel51/fiftyone/security/advisories/GHSA-q78p-hj9h-5466","tags":["x_refsource_CONFIRM","advisory","web"]},{"url":"https://github.com/voxel51/fiftyone/commit/6c4fa1b27bf53e4ba567742ffd20d033af7b9e64","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/voxel51/fiftyone/commit/7c5b92eec5c7c0210c0c8134351ced77d2800ae0","tags":["x_refsource_MISC","fix","web"]},{"url":"https://github.com/voxel51/fiftyone/releases/tag/v1.17.0","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/advisories/GHSA-q78p-hj9h-5466","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53656.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53656","tags":["advisory"]},{"url":"https://github.com/voxel51/fiftyone","tags":["package"]},{"url":"https://pypi.org/project/fiftyone","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-53656","title":"FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data","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.","status":"published","published":"2026-08-21T20:34:55.783Z","modified":"2026-08-21T21:42:44.374Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-346","CWE-942"],"updated_at":"2026-11-02T14:20:00.11477Z"}],"euvd":[{"id":"EUVD-2026-64145","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.","status":"published","published":"2026-08-21T20:34:55Z","modified":"2026-08-21T21:42:44Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T18:01:36.844009Z"}],"ghsa":[{"id":"GHSA-q78p-hj9h-5466","title":"FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data","description":"### 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's running FiftyOne server and read the responses**.\n\nCombined 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.\n\nThe 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.\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='https://app.example.com,http://localhost:3000'\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 – Broken Access Control: https://owasp.org/Top10/2025/A01_2025-Broken_Access_Control/","status":"published","published":"2026-07-15T21:57:29Z","modified":"2026-07-15T21:57:29Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-346","CWE-942"],"updated_at":"2026-11-02T14:40:43.958448Z"}],"nvd":[{"id":"CVE-2026-53656","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.","status":"published","published":"2026-08-21T21:17:00.113Z","modified":"2026-10-12T16:10:00.22Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-346","CWE-942"],"updated_at":"2026-11-02T14:12:40.665005Z"}],"osv":[{"id":"CVE-2026-53656","title":"FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data","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.","status":"published","published":"2026-08-21T20:34:55.783Z","modified":"2026-10-28T02:30:59.2186178Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-346","CWE-942"],"updated_at":"2026-11-02T15:45:08.132336Z"},{"id":"GHSA-q78p-hj9h-5466","title":"FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data","description":"### 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's running FiftyOne server and read the responses**.\n\nCombined 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.\n\nThe 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.\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='https://app.example.com,http://localhost:3000'\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 – Broken Access Control: https://owasp.org/Top10/2025/A01_2025-Broken_Access_Control/","status":"published","published":"2026-07-15T21:57:29Z","modified":"2026-07-23T15:11:30.439750388Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-346","CWE-942"],"updated_at":"2026-11-02T15:46:54.055966Z"},{"id":"PYSEC-2026-3465","title":"FiftyOne App server uses wildcard CORS (Access-Control-Allow-Origin: *), enabling cross-origin reads of local server data","description":"### 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's running FiftyOne server and read the responses**.\n\nCombined 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.\n\nThe 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.\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='https://app.example.com,http://localhost:3000'\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 – Broken Access Control: https://owasp.org/Top10/2025/A01_2025-Broken_Access_Control/","status":"published","published":"2026-07-23T11:41:45.496676Z","modified":"2026-07-23T15:00:12.485654918Z","cvss":[{"version":"3.1","score":6.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:56.847083Z"}]}}