CVE-2026-33866

Name: CVE-2026-33866
Creator: NVD / NIST
Published: 2026-04-07T13:16:47+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2026-33866 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS 4.0

5.3/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.36%

28.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions
Lfprojects	Mlflow	<= 3.10.1

References

https://afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectorsExploit, Third Party Advisory
https://cert.pl/en/posts/2026/04/CVE-2026-33865/Third Party Advisory
https://github.com/mlflow/mlflow/pull/21708Issue Tracking, Patch

Timeline

Published: Apr 7, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33866?

How severe is CVE-2026-33866?

CVE-2026-33866 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33866?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33866?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST