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CVE-2026-33866

Authorization Bypass in MLflow AJAX Endpoint

Published: Apr 7, 2026Updated: Apr 20, 2026 Sources: CVE List NVDCWE-862
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.4%
Top 72.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-862

Affected Products

mlflowlfprojects
On-premLibrary
AI / ML / notebook-mlops
MlflowMlflow
Mixed
AI / ML / notebook-mlops
lfprojectsoss-projectAI / MLaka mlflow, valkey, model context protocol servers, mcp servers
mlflowoss-projectAI / MLaka mlflow

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectors
afine.com
https://cert.pl/en/posts/2026/04/CVE-2026-33865/
cert.pl
https://github.com/mlflow/mlflow/pull/21708
github.com

Timeline

Published
Apr 7, 2026
Last Updated
Apr 20, 2026

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