CVE-2026-2651Public exploitNetwork attack vector

Authenticated cross-user artifact overwrite via unchecked MPU routes

Published May 25, 2026 · Updated May 25, 2026

Missing authorization in MLflow before 3.10.0 allows remote authenticated users to overwrite other users' artifacts through MPU endpoints. The server's _is_proxy_artifact_path function omits /mlflow-artifacts/mpu/ prefixes, so POST requests bypass validate_can_update_experiment_artifact_proxy. The server must run with artifact serving and basic authentication enabled; a low-privileged user can replace model content, with code execution occurring only if another user loads the poisoned model.

CVSS severity9.0
Critical
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in MLflow before 3.10.0 allows remote authenticated users to overwrite other users' artifacts through MPU endpoints. The server's _is_proxy_artifact_path function omits /mlflow-artifacts/mpu/ prefixes, so POST requests bypass validate_can_update_experiment_artifact_proxy. The server must run with artifact serving and basic authentication enabled; a low-privileged user can replace model content, with code execution occurring only if another user loads the poisoned model.

The record

CVE
CVE-2026-2651
Published
May 25, 2026
Updated
May 25, 2026
Vendor
MLflow Project
Product
MLflow
Classifications
CWE-862, CWE-1220, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 25, 2026CVE publishedPublication date reported by the CVE source.
  2. May 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <3.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MLflow Project · MLflowversion=unspecified <3.10.0

Published CVSS scores

9.0huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-1220Insufficient Granularity of Access Control
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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