CVE-2026-33866: lfprojects mlflow Missing Authorization
Vulnerability summary
CVE-2026-33866 is a medium (CVSS 5.3) Missing Authorization vulnerability in lfprojects mlflow. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 30% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 0 · Related 1Timeline
- 07-04-2026PublishedVulnerability first disclosed.
- 14-04-2026Last modifiedVulnerability information updated.
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 metrics
6 scores · 5 sources · 2 versions- OSV · WolfiEcosystem advisory · calculated5.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- OSV · ChainguardEcosystem advisory · calculated5.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- NVDNIST5.3MediumCVSS: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
- NVDNIST4.3MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS trend
Probability
0.37%
Chance of exploitation in the next 30 days
Percentile
30%
Versus all other CVEs
30-day change
+0.01 pp
From 0.36% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (afine.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Chainguard2 products
- mlflow< 3.11.1-r0 | < 3.16.0-r0
- mlflow-fips< 3.11.1-r0
Lfprojects1 product
- mlflow≤ 3.10.1
Mlflow1 product
- mlflow≤ 3.10.1
PyPI1 product
- mlflow< 3.11.0rc0
Wolfi1 product
- mlflow< 3.11.1-r0 | < 3.16.0-r0
5 vendors · 6 products
References
12 links- afine.com/blogs/attacking-mlflow-how-ml-artifacts-become-attack-vectorsExploitTechnical DescriptionWEBEVIDENCEThird Party Advisory
- github.com/mlflow/mlflowPACKAGE
- github.comWEB