CVE-2026-33866 PUBLISHED

Authorization Bypass in MLflow AJAX Endpoint

Assigner: CERT-PL
Reserved: 24.03.2026 Published: 07.04.2026 Updated: 07.04.2026

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

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 5.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Mlflow
Product	Mlflow
Versions	Default: unaffected affected from 0 to 3.10.1 (incl.)

Credits

Sławomir Zakrzewski (AFINE) finder

References

Problem Types

CWE-862 Missing Authorization CWE

Impacts

CAPEC-115: Authentication Bypass