Authorization Bypass in mlflow/mlflow

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Summary

CVECVE-2026-8147
StatePUBLISHED
Assigner@huntr_ai
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-02 09:16:19 UTC
Updated2026-07-06 16:46:06 UTC
DescriptionIn MLflow versions prior to 3.14.0, when running with authentication enabled, the trace API endpoints lack proper authorization validators. This allows any authenticated user to bypass experiment-level authorization controls on all trace operations, including reading, deleting, and modifying traces on experiments they do not have permission to access. The issue arises from the `_before_request` handler, which does not register authorization validators for trace endpoints, resulting in requests proceeding without validation. This vulnerability can expose sensitive data, destroy audit logs, and allow unauthorized modifications.

Risk And Classification

Primary CVSS: v3.0 8.1 HIGH from [email protected]

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

EPSS: 0.003370000 probability, percentile 0.256530000 (date 2026-07-06)

Problem Types: CWE-284 | NVD-CWE-noinfo | CWE-284 CWE-284 Improper Access Control

VersionSourceTypeScoreSeverityVector
3.0[email protected]Secondary8.1HIGHCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.0CNADECLARED8.1HIGHCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Lfprojects Mlflow All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mlflow Mlflow/mlflow affected unspecified 3.14.0 custom Not specified

References

ReferenceSourceLinkTags
huntr.com/bounties/b00c3ddd-373e-492f-9bf0-41a28bb21ed5 134c704f-9b21-4f2e-91b3-4a467353bcc0 huntr.com Exploit, Third Party Advisory
github.com/mlflow/mlflow/commit/f9b1eb510478570609ef451984a255775aa4b937 [email protected] github.com Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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