Medium severity · published Apr 7, 2026
CVE-2026-33866
Authorization Bypass in MLflow AJAX Endpoint
4.3
CVSS
0.4%
EPSS
No
On KEV
Description
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
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ML
Mlflow · Mlflow
through 3.10.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33866
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33866
Exploit
https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors
Third Party Advisory
https://cert.pl/en/posts/2026/04/CVE-2026-33865/
Issue Tracking
https://github.com/mlflow/mlflow/pull/21708
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No description published yet