{"id":"CVE-2026-33866","summary":"Authorization Bypass in MLflow AJAX Endpoint","details":"MLflow is vulnerable to an authorization bypass affecting the AJAX endpoint used to download saved model artifacts. Due to missing access‑control validation, a user without permissions to a given experiment can directly query this endpoint and retrieve model artifacts they are not authorized to access.\n\n \nThis issue affects MLflow version through 3.10.1","aliases":["BIT-mlflow-2026-33866","GHSA-46r5-x6jq-v8g6","PYSEC-2026-94"],"modified":"2026-07-08T08:12:49.979404297Z","published":"2026-04-07T12:57:44.380Z","related":["CGA-3445-hvc7-xhpx"],"database_specific":{"cna_assigner":"CERT-PL","cwe_ids":["CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33866.json"},"references":[{"type":"WEB","url":"https://github.com/"},{"type":"WEB","url":"https://github.com/mlflow/"},{"type":"ADVISORY","url":"https://cert.pl/en/posts/2026/04/CVE-2026-33865/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33866.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33866"},{"type":"FIX","url":"https://github.com/mlflow/mlflow/pull/21708"},{"type":"EVIDENCE","url":"https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mlflow/mlflow","events":[{"introduced":"0"},{"last_affected":"cadc323c059d08ee15c3a312afd0eefeeccedc94"}],"database_specific":{"cpe":"cpe:2.3:a:lfprojects:mlflow:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"3.10.1"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["v3.10.1","v3.10.0","v3.10.0rc0","nightly","v3.0.0","v2.2.0","v1.7.0","1.0.0","v0.8.1","v0.8.0","v0.7","v0.6.0","v0.5.0","v0.4.2","v0.4.1","v0.4.0","v0.3.0","v0.2.1","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33866.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}