Auth bypass in Lfprojects Mlflow
CVE-2026-33866
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. This issue affects MLflow version through 3.10.1
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Lfprojects Mlflow
- Mlflow — versions 0
Weakness classification (CWE)
References
- github.com/mlflow/mlflow/pull/21708 (Patch, patch, Issue Tracking)
- cert.pl/en/posts/2026/04/CVE-2026-33865/ (Third Party Advisory, third-party-advisory)
- afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors (Exploit, technical-description, Third Party Advisory, exploit)
Frequently asked questions
- What is CVE-2026-33866?
- CVE-2026-33866 is a medium-severity vulnerability in Lfprojects Mlflow, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-04-07.
- How severe is CVE-2026-33866?
- Medium severity. CVSS v3 base score is 4.3 out of 10.