CVE-2026-2734 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-2734MEDIUM

mlflow mlflow/mlflow — Authorization Bypass in SearchModelVersions in mlflow/mlflow

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  N  N    6.5   .0044   36.9     —

AFFECTED
  Product        Versions       Fixed
  mlflow/mlflow  unspecified –  —

TIMELINE
  Feb 19  Reserved by @huntr_ai
  May 21  EXPLOIT PUBLISHED — CVE-2026-2734 (mlflow/mlflow). Public exploit reference added.
  May 21  Published (CNA: @huntr_ai)

CWE-284 · CNA: @huntr_ai · CVSS v3.0 · 2 references · NVD status: Analyzed

Description

In mlflow/mlflow versions up to 3.9.0, the `SearchModelVersions` REST API endpoint and the `mlflowSearchModelVersions` GraphQL query lack proper per-model authorization checks when basic authentication is enabled. This allows any authenticated user to enumerate all model versions across all registered models, regardless of their permission level. The issue arises due to the absence of `SearchModelVersions` in the `BEFORE_REQUEST_VALIDATORS` and `AFTER_REQUEST_HANDLERS` for the REST API, and its omission from `GraphQLAuthorizationMiddleware.PROTECTED_FIELDS` for GraphQL. This vulnerability can expose sensitive information such as model names, version descriptions, source URIs, tags, and other metadata, potentially revealing proprietary or confidential details in multi-tenant environments. The issue is resolved in version 3.10.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
February 19, 2026	Reserved	Reserved by @huntr_ai
May 21, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-2734 (mlflow/mlflow). Public exploit reference added.
May 21, 2026	Published	Published (CNA: @huntr_ai)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
mlflow	mlflow/mlflow	—	unspecified	—

Weaknesses

CWE-284

References (2)

https://github.com/mlflow/mlflow/commit/6989066af33fdcb03588fd71a1a67f8fc5ef12c9 [Patch]
https://huntr.com/bounties/d632f783-b2c7-4a3b-af5e-1d693e841c08 [Exploit, Third Party Advisory]

Authoritative record: CVE-2026-2734 at cve.org

Vendors: mlflow

Weaknesses: CWE-284

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-2734 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.