Missing Authorization Validation in mlflow/mlflow

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Summary

CVECVE-2026-2651
StatePUBLISHED
Assigner@huntr_ai
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-25 07:16:15 UTC
Updated2026-05-26 20:06:20 UTC
DescriptionA vulnerability in MLflow versions <=3.10.1.dev0 allows unauthorized access to multipart upload (MPU) endpoints when the `--serve-artifacts` mode is enabled. The authorization logic does not enforce resource-level permission checks for `/mlflow-artifacts/mpu/*` endpoints, enabling attackers to overwrite artifacts belonging to other users. This can lead to unauthorized cross-user writes, model supply chain poisoning, and arbitrary code execution when compromised models are loaded. The issue is resolved in version 3.10.0.

Risk And Classification

Primary CVSS: v3.0 9 CRITICAL from [email protected]

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

EPSS: 0.000530000 probability, percentile 0.167020000 (date 2026-05-28)

Problem Types: CWE-862 | CWE-862 CWE-862 Missing Authorization

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary9CRITICALCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
3.0CNADECLARED9CRITICALCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mlflow Mlflow/mlflow affected unspecified 3.10.0 custom Not specified

References

ReferenceSourceLinkTags
github.com/mlflow/mlflow/commit/d7290811d8f3c95366d80109424edc1fb1ad966f [email protected] github.com
huntr.com/bounties/65beb119-d3e0-4e03-af2f-fa98f78f83dc 134c704f-9b21-4f2e-91b3-4a467353bcc0 huntr.com
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