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CVE-2026-8147

Authorization Bypass in mlflow/mlflow

8.1 HighFix available

In 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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

0.55%Up 0.2 points since Jul 2, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.1

Authorization Bypass in mlflow/mlflow

In 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.

Record
CVE-2026-8147
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-284
Updated
2026-11-02
EUVDEUVD-2026-41257 8.1

In 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.

Record
EUVD-2026-41257
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-2cm6-r77w-6g96 8.1

MLflow: trace API endpoints lack proper authorization validators

In MLflow versions prior to 3.13.0, 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.

Record
GHSA-2cm6-r77w-6g96
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-284
Updated
2026-11-02
NVD 8.1

In 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.

Record
CVE-2026-8147
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-284
Updated
2026-11-02
OSV 8.1

Authorization Bypass in mlflow/mlflow

In 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.

Record
CVE-2026-8147
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-284
Updated
2026-11-02
OSVGHSA-2cm6-r77w-6g96 8.1

MLflow: trace API endpoints lack proper authorization validators

In MLflow versions prior to 3.13.0, 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.

Record
GHSA-2cm6-r77w-6g96
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-284
Updated
2026-11-02
OSVPYSEC-2026-3686 8.1

MLflow: trace API endpoints lack proper authorization validators

In MLflow versions prior to 3.13.0, 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.

Record
PYSEC-2026-3686
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVBIT-mlflow-2026-8147 No score

Authorization Bypass in mlflow/mlflow

In 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.

Record
BIT-mlflow-2026-8147
Updated
2026-11-02
OSVCLSA-2026-1788442606 No score

TuxCare security update for mlflow (1 CVE)

TuxCare rebuilt mlflow to address 1 CVE. Fixed in 2.22.4.post8+tuxcare.

Record
CLSA-2026-1788442606
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mlflow
PyPI
2.14.0rc0 up to 3.13.0rc0
3.13.0rc0
mlflow
Bitnami
before 3.14.0
3.14.0
mlflow
TuxCare:PyPI
2.22.4 up to 2.22.4.post8+tuxcare, plus listed versions
2.22.4.post1+tuxcare2.22.4.post2+tuxcare2.22.4.post3+tuxcare2.22.4.post4+tuxcare2.22.4.post5+tuxcare2.22.4.post6+tuxcare2.22.4.post7+tuxcare
2.22.4.post8+tuxcare
mlflow
PyPI
2.14.0rc0 up to 3.13.0rc0, plus listed versions
2.14.02.14.12.14.22.14.2.dev02.14.3
Show 45 moreShow less
2.15.02.15.0rc02.15.12.16.02.16.12.16.22.17.02.17.0rc02.17.12.17.22.18.02.18.0rc02.19.02.19.0rc02.20.02.20.0rc02.20.12.20.22.20.32.20.42.21.02.21.0rc02.21.12.21.22.21.32.22.02.22.0rc02.22.12.22.22.22.32.22.42.22.53.0.03.0.0rc03.0.0rc13.0.0rc23.0.0rc33.0.13.1.03.1.0rc03.1.13.1.23.1.33.1.43.10.0
3.13.0rc0

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-8147 is a high vulnerability (CVSS 8.1) in Lfprojects Mlflow, published July 2, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.55%, the 46th percentile. Fixed in mlflow 3.13.0rc0.

References

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Left out here: 28 versions. The JSON record has them.

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