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Vulnerabilities

Vulnerability · CVE-2026-2652

lfprojects mlflow Authentication Bypass by Primary Weakness

Published May 15, 2026 · catalog updated Aug 7, 2026 · lfprojects mlflow Authentication Bypass

Patch now

CVE-2026-2652 is in the CISA known-exploited catalog. Confirm lfprojects mlflow Authentication Bypass against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (lfprojects mlflow Authentication Bypass).
Severity
High8.6
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
1.41%
Remediation
Remediation guidance
Affected products
cpe lfprojects/mlflow · stated mlflow · vendor lfprojects mlflow

A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled ( ) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on routes, leaving other routes such as the Job API ( ) and the OpenTelemetry trace ingestion API ( ) unprotected. This allows unauthenticated remote attackers to submit jobs, read job results, cancel running jobs, and inject arbitrary trace data into experiments. The issue arises from an architectural mismatch between Flask and FastAPI authentication mechanisms, where the function fails to handle non- paths, resulting in a complete authentication bypass. This vulnerability is fixed in version 3.10.0.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe lfprojects/mlflowversion unspecified
  • stated mlflow<= 3.9.0
  • vendor lfprojects mlflowversion unspecified

How to fix CVE-2026-2652

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-2652 is in the CISA known-exploited catalog. Confirm lfprojects mlflow Authentication Bypass against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with <= 3.9.0. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-305. EPSS 1.41%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 15, 2026 · NIST NVD

    Detected

    A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled ( ) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on routes, leaving other routes such as the Job API ( ) and the OpenTelemetry trace ingestion API ( ) unprotected. This allows unau

  2. Jun 17, 2026 · NIST NVD

    Updated

    A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled ( ) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on routes, leaving other routes such as the Job API ( ) and the OpenTelemetry trace ingestion API ( ) unprotected. This allows unau

  3. Aug 7, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  4. Aug 7, 2026 · VulnCheck KEV

    Updated

    A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled ( ) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on routes, leaving other routes such as the Job API ( ) and the OpenTelemetry trace ingestion API ( ) unprotected. This allows unau

Sources

  • CVE.orgVulnerability recordCVE-2026-2652

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-2652

    30-day exploitation probability 1.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-2652

    A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled ( ) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces auth

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-2652

    A vulnerability in mlflow/mlflow versions 3.9.0 and earlier allows unauthenticated access to certain FastAPI routes when the server is started with authentication enabled ( ) and served via uvicorn (ASGI). The FastAPI permission middleware only enforces authentication on routes,

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.